Most of the shorter class Cs and the little Bs won't have much snort left for a larger trailer, but it all depends what, where, how often and how far you want to tow.
Personally the combination sounds a bit un wieldy to me but if you need separate living space for a lot of people then find the biggest engine, lowest ratio axle class C you can afford.
Just because it's unconventional seeing a camper towing a camper don't mean you can't doo it!
Have to ask though, what is the want or need to haul 2 separate living areas camping?
Long term digs with a short term adventure vehicle you can overnight in? Have to take the in laws with but don't like them? Got a gaggle of kids and an overflow chase vehicle?
Any of the above save for the first scenario would have me looking at one large camper of some sort and a toad or chase vehicle.
