It appears to be a angle iron trailer. Fine for running on roads, but not designed for serious off road. If you are using it for travel to the trail head and camping there, it will do an excellent job.
Building trailer for over 6 years, I have learned to stay away from angle iron like the plague. Once it bends it is done, box tubing trailers are much stronger and retain their original design much much better. There are numerous builders that do that. Adventure Trailer builds and excellent one, but the price is considerably more. You can also try Aspen Trails Trailers, same quality as the AT but more reasonably priced. 951 692 0958.
Building trailer for over 6 years, I have learned to stay away from angle iron like the plague. Once it bends it is done, box tubing trailers are much stronger and retain their original design much much better. There are numerous builders that do that. Adventure Trailer builds and excellent one, but the price is considerably more. You can also try Aspen Trails Trailers, same quality as the AT but more reasonably priced. 951 692 0958.