Hi Jim,
A couple of things in favour of a trailer.
First, there is no need for a towed vehicle. Toads add a second vehicle to maintain along with the main rig. Second, if something happens with the motor or drive train in a motorized RV, most times you’re going to be looking for a motel to stay in until it’s repaired. That can be anywhere from a day to a week or more.
As for trailers to fifth wheels, the main point is weight distribution. A fifth wheel has a higher pin weight centered over the rear axle. This can easily exceed a thousand pounds (half ton max). For you, this would mean a new (to you) vehicle. Trailer pin weights rarely exceed 400 pounds.
Just some things to think about.
Cheers