Don is right. Building the typical tiny house using conventional building materials will overload the frame and axles.
I used to build yard barns at my house and deliver them to the customer's site. An 8' x 12' yard barn built w/16" OC frame needed a tandem axle equipment trailer to deliver. These yard sheds had some wiring but no plumbing, no interior paneling, no finished flooring, and no appliances. They were heavy enough, I'd estimate 4K -> 5K lbs.
An alternative to salvage what you have and make something ready for camping may be an all-aluminum shell or even a conestoga style wagon that has a canvas top. Done right, they can be a very attractive tiny house. Research "sheep herder" wagons.