I've rebuilt one once to do just that. What I found:
The frame needs to be about twice as stiff,you may have to add a subframe
You need shocks, without shocks, gravel roads snap springs.
Approach and departure angles have to be looked at.
If you use proper jacks, like the ones used for stabilisers on TT, you can lift the tent trailer allowing for some very rough campsites and tire changes
Two spares.
I laugh at those mudders on pop-ups. You only need something like that to get sidewall protection and those cheap ones don't have that.
Another option is an Aussie style camping trailer.