IdaD wrote:
I don't think the standard pop up type trailers like the Jayco that are lifted and have offroad tires are modified aside from those differences. The frames and interior bits are certainly all the same as far as I know. You could save some bucks by finding a nice used unit and then do the mods yourself. Keep the length short because the limiting factor on that type of rig on rough roads is likely your approach and departure angles. On that note you might also think about picking up some free standing stabilizer jacks and removing the crankdown jacks on the trailer to prevent them from being torn off. Trust me, I've done it...
Jayco in Australia, does make a specific Off Road Popup Camper, but these are not available in the US