Renting TT's will limit your options greatly, AND over time the models available are going to change.
You can find 17' fully self contained TT's that should tow okay with that rig, I originally towed the one in my sig with V6 Nissan Frontier and it handled it well enough (although struggled on steeper mountain inclines). However there are trade-offs, holding tank sizes tend to be small (and way overstated by manufacturer in my case) and cargo capacity will of course be smaller as well.