I can't think of many US maufacturers that make TT like the off road versions made in Australia. That is probably because much of the continental US is covered by paved roads.
I couldn't find a trailer that had much of the positive attributes to suit me so ended up building a trailer for my old Avion C-11 camper.
Very few 19' trailers will have decent ground clearance, 80 gallons of water, 20 gallons of gasoline, 20 gallons of black water, 20 gallons of gray water, 100# of propane, room for one quad, E rated tired to match the F-350 pulling it, and over 1500# of payload above the wet weight.
As eluded to earlier in this post, the key to success in driving on rough roads is to drive the proper speed for the conditions. Going slow in rough conditions will certainly save your equipment. You still need enough ground clearance to clear the obstacles that may be in your way.
