so your SxS does not fit in the toy hauler? you must need a big trailer your planing to tow behind your truck camper?
your looking at a 10' camper to put on your 8' bed. your going to have to extend your hitch. the affordable stuff is only going to allow you to tow around 6000 lbs, 600lbs tong weight with weight distribution. or you can drop a couple thousand and get the Torklift hitch.
We have a 30' 5th wheel AND our truck camper. when using the truck camper we also tow a 7x14 box trailer with a BMW R1200gs inside. we have found that we can use the bike trailer as a enclosed patio when weather is inclement.
your also going to miss the storage in the larger RV, but you can pack some cloths in the box trailer (or truck)
also do you have kids you will be traveling with?