TL;DR: Camping trailers trace from Romani horse-drawn caravans in Europe to the mass-market towable rigs that defined 20th-century American road culture. A 1968 patent by Lloyd Bontrager captured the extending side-panel design that made interior living space genuinely practical. Original prints of that patent drawing are available framed or unframed.
In 1919, a group of travelers calling themselves the Tin Can Tourists held their first organized rally in Tampa, Florida. They had arrived in cars with makeshift sleeping compartments bolted to the chassis or towed behind on rudimentary wooden frames. The name was both a joke and a badge of pride: these were ordinary Americans sleeping in tin cans, making their own roads, accountable to no hotel schedule. Within a decade, the phenomenon they represented would become one of the defining leisure movements of the 20th century.
The camping trailer as a mass-market product was barely twenty years old when that rally happened. But the idea behind it, a mobile shelter that travels with its occupant, is far older and traces to a very different kind of traveler.
The Romani Caravan: The Original Mobile Home
The ancestors of the modern camping trailer are the horse-drawn caravans of the Romani people of Europe. The Romani had lived as traveling communities for centuries, and their caravans, known as vardos, were extraordinary feats of small-space design. A well-built vardo contained a sleeping area, storage, a small cooking space, and decorative woodwork of considerable artistry, all within a footprint small enough to be pulled by a single horse.
Different regional styles of vardo emerged across Britain and Europe. The bow-top, with its canvas-covered curved roof, was lighter and better suited to rough roads. The ledge wagon was sturdier and better insulated for colder climates. Each design reflected the particular terrain and travel patterns of the communities that used them. What they shared was a fundamental logic: the home travels with the traveler, and every inch of space serves a purpose.
The Romani vardo influenced the first purpose-built touring caravan for wealthy travelers. In 1880, Dr. William Gordon Stables, a Scottish physician and author, commissioned a custom horse-drawn caravan he named "The Wanderer." It was 18 feet long, weighed over three tons, and included amenities that would not look out of place in a small apartment: a proper bed, bookshelves, a writing desk, and even a clock. Stables toured Britain in it for two seasons and wrote about the experience, introducing the concept of leisure caravanning to a middle-class British readership.
The Automobile Changes Everything
The introduction of affordable automobiles in the early 1900s transformed camping from an upper-class novelty into a working-class possibility. Henry Ford's Model T, introduced in 1908 and priced within reach of ordinary families by the mid-1910s, meant that millions of Americans suddenly had both the vehicle and the economic motive to find alternatives to expensive hotels.
Early auto-campers were improvising everything. Some slept in their cars. Others built wooden platforms that bolted to running boards, creating elevated sleeping surfaces. Tent manufacturers began offering canvas attachments designed to connect directly to early automobiles. None of these solutions was elegant, but all of them reflected the same impulse: people wanted to travel on their own terms, stay where they chose, and carry their shelter with them.
The Good Roads Movement, which had been lobbying for paved highway infrastructure since the 1890s, began to see results in the 1910s. Better roads made longer trips practical, and longer trips required better sleeping arrangements than a canvas draped over a car door.
The Rise of the Motorhome and Its Limitations
By the late 1910s and early 1920s, a different approach had appeared: the motorhome, a self-contained vehicle that integrated the driving cab with the living quarters. Early motorhomes were often custom-built conversions of truck chassis, fitting sleeping berths, simple kitchens, and storage into a single vehicle.
The motorhome had real advantages: no separate towing vehicle required, no hitching and unhitching at each stop. But it also had two significant problems that early adopters discovered quickly. First, a motorhome is the only vehicle you have. If you want to drive into town for supplies, you break camp, pack up, and take the whole living unit with you. Second, the size required for a livable interior placed motorhomes in a class of vehicle that many rural roads of the era simply could not accommodate.
These limitations created the conditions for the towable travel trailer. If the living unit could be separated from the towing vehicle, you solved both problems at once: park the trailer, unhitch the car, and drive wherever you need to go. It was a simpler solution, and simpler solutions tend to win.
Tin Can Tourists and the Trailer Boom
The 1920s and 1930s saw the travel trailer transition from curiosity to industry. Manufacturers including Covered Wagon Company, which began production in 1929, built trailers on assembly lines for the first time. The designs were still basic: lightweight wood frames, canvas or aluminum siding, minimal plumbing. But they were purpose-built for towing rather than improvised from other vehicles.
The Great Depression paradoxically accelerated trailer adoption. Families who had lost homes or jobs found that a trailer could provide stable, low-cost housing with the flexibility to follow work wherever it appeared. The "tin can tourist" of the 1920s, a leisure traveler by choice, was joined in the 1930s by people who lived in trailers because it was the most practical housing available.
By the late 1930s, the Airstream Clipper, introduced in 1936, had established the aesthetic that still defines the category: aluminum shell, aircraft-influenced curves, polished exterior. Wally Byam's design was lighter than wood-frame competitors and more aerodynamic, reducing the strain on towing vehicles. It set the standard for what a serious travel trailer should be.
World War II interrupted civilian trailer production but also accelerated the manufacturing techniques that would make postwar trailers better and cheaper. Aluminum fabrication, welding technology, and lightweight composites all advanced rapidly during the war years. By the late 1940s, manufacturers could build a more capable trailer at lower cost than had been possible a decade earlier.
The Patent That Solved the Space Problem
The postwar boom in American leisure culture produced a new generation of campers with higher expectations. Families wanted trailers that felt like real living spaces, not cramped utility boxes on wheels. The central constraint was geometric: a trailer that fits on a highway must be narrow enough to stay in its lane, but the people inside need room to move around.
Lloyd Bontrager of Star Tank and Boat Co. attacked this problem directly. In 1968, he was granted a U.S. patent for a camper trailer design with extending side panels. When the trailer was on the road, the sides folded in to highway-legal width. When parked, the panels extended outward, dramatically increasing the interior floor space without changing the trailer's towing profile.
The design was elegant in the way that genuinely useful inventions tend to be: it solved a real constraint rather than adding features. Bontrager went on to file several additional trailer patents, and his 1968 design is currently held by the Rokane Investment Group. The extending side-panel concept he patented became a standard feature of the pop-out and slide-out designs that define modern RV construction.
Today, the RV industry ships more than 600,000 units per year in the United States alone, and towable trailers account for the majority. The industry that started with Romani vardos and tin-can improvisation has become one of the largest segments of American leisure manufacturing, and the geometry that Lloyd Bontrager solved in 1968 is still the reason modern trailers feel like they have more space than they should.
Frequently Asked Questions
Where did the camping trailer originate?
The camping trailer traces its lineage to the horse-drawn vardos of the Romani people of Europe, which served as full-time mobile homes for traveling communities over centuries. The first purpose-built leisure caravan for wealthy travelers appeared in Britain in 1880. The towable camping trailer as an American mass-market product developed in the 1920s, driven by the widespread availability of the automobile.
Who were the Tin Can Tourists?
The Tin Can Tourists were an organized group of American automobile campers who began holding rallies in 1919. The name referred to the improvised tin-and-canvas sleeping rigs early campers built onto their cars. The movement represented the first wave of mass auto-camping culture in the United States, predating the commercial travel trailer industry by several years.
What is the history of the Airstream trailer?
The Airstream Clipper was introduced by Wally Byam in 1936, establishing the aluminum-shell, aerodynamically curved design that became the most recognized form in American trailer history. The design was lighter and more aerodynamic than wood-frame competitors. Airstream survived the Great Depression and World War II to become the enduring icon of the travel trailer industry.
What did Lloyd Bontrager patent in 1968?
Lloyd Bontrager of Star Tank and Boat Co. was granted a patent in 1968 for a camper trailer design with extending side panels. When towing, the panels folded to highway-legal width. When parked, they extended outward to increase interior floor space. The design anticipated the slide-out expansion systems that became standard features of modern RVs.
How large is the RV and camping trailer industry today?
The U.S. RV industry ships more than 600,000 units annually, with towable trailers accounting for the majority of shipments. The industry traces directly from the improvised automobile camping of the 1910s and 1920s, with each generation of trailers building on the manufacturing and design innovations of the previous one.
Written by Rider Tuff, founder of Timeless Patents. Timeless Patents makes museum-quality patent art prints from original U.S. Patent Office documents, celebrating the inventors behind your favorite sports, hobbies, and passions. Every print is available framed or unframed. Shop the full camping collection →
