As a data point, I often go without a trailer in my Toyota Sequoia. This year we had 4 people comfortably seated with a 15'8' PVC Saturn Triton raft, NRS frame, 4 oars, two dry boxes, bimini, etc etc. If we roll with a big cooler, it goes on the back on a hitch carrier, no need for anything on the roof. We did a partial self shuttle due to the Wild River Shuttles issues so we had a motorcycle on the back and relied on the other boats for a cooler. Driving long distances without a trailer is really great and with 8 hands the raft goes together just fine. Shorter travel distance, fewer hands, and fewer days on the river are all factors that put my boat on a trailer.
The welded seam PVC boats are hard to roll, especially when cold. The PVC 15.8 with big tubes rolls larger than an 18' Hypalon in my experience and is twice as frustrating. PVC fights back, Hypalon doesn't, just depends on your budget and use case.
Whatever gets you on the water!
Cheers,
-Thomas