When planning a larger tiny home build, choosing the right foundation is one of the most important decisions you’ll make. While standard 8.5-foot-wide trailers work well for many builds, more builders are looking to wider formats to gain additional interior layout options without sacrificing ceiling height or adding a loft.
We put together a video walkthrough of one of our largest bumper pull models: a 40-foot long by 12-foot wide tiny house trailer. this is the single most popular trailer we build. The trailer featured below is a standard deck trailer, with this trailer you can also get drop axles and you can also do a deckover style (which is the most commonly build when choosing 12ft wide)
Key Specifications
- Style: Bumper Pull Tiny House Trailer
- Dimensions: 40 Feet Long by 12 Feet Wide (specifically built to 11 ft 10 in for transport reasons)
- Axles & Capacity: Quad Axles with electric brakes on every axle, providing a total capacity of 28,000 lbs
- Frame Construction: 2×8 box tube main frame, 2×6 outer frame beams, and 2×4 box tube crossmembers spaced 16 inches on center
- Options: Flush Crossmembers, Square Wheel Wells, Threaded Rods, Brakes on All Axles, Extended Tongue.
Important Considerations for Wide Trailers
1. Smart Sizing for Transport
One interesting detail about this particular trailer is that while it is designed for a wide layout, the physical steel frame was built to 11 feet 10 inches wide.
By keeping it just under the 12-foot threshold at the frame level, the customer saved significantly on transport logistics, avoiding the need for pilot cars during the initial trailer delivery (though finished roof overhangs may still require pilot cars when the completed home moves). We can build these trailers to exact fractional dimensions depending on what works best for your build and shipping route. 99 out of 100 customers do the 11ft 10in width deck.
2. Heavy-Duty Framing and Support
Because of the scale of a 40-foot bumper pull, structural stability is essential. This model features robust 2×8 main frame members to support the quad-axle layout, along with flush crossmembers and built-in threaded rod tie-down anchor points to secure the house structure to the foundation.
3. Deck Height and Customization
With straight axles, the standard deck height sits at approximately 28 inches. Depending on your design preferences, drop axles will lower the deck to about 24in and the deckover style will be at around 34in above grade. popular customizations are dual jacks on the front of the deck in lieu of the single tongue jack, Custom Front Bumpouts with the extended tongue, Square fenders, Threaded Rods and flush crossmembers.
Explore Your Options
Whether you are designing a bumper pull or a gooseneck foundation, customizing your trailer width and length can make a major difference in your floor plan layout.
👉 Visit Tiny House Basics to Learn More and Request a Quote