The GMC Motorhome is NOT a performance vehicle. It wallows in tight curves, barely stays straight on good roads. It is at least 40 years old, and designed around parts plucked from production lines of various automobiles of the era. Nothing state of the art about the suspension and drive train.
It does a fair job of point to point transportation of a heavy vehicle that has a great deal of its weight centered above the tops of the tires.
A race car, it definitely is NOT! If you do not expect sports car handling, and maintain the drive train/suspension parts well, it is safe enough to drive in traffic if you don't follow too closely and drive "eyes way down the road ahead", you won't get in too much trouble.
There are upgrades that improve braking quite a bit, and that is one huge reason for the 1-ton conversion. That and much stronger lower control arms and front wheel bearings as well as upper and lower ball joints. Handling? Very subjective at best. It still is a top heavy front wheel drive vehicle. Not much will ever change those facts.
Do I love them? Yep! But, don't put lipstick on them. Underneath, they are still a very good looking pig.(grin)
Jim Hupy
Salem, Oregon