I ran that section a few years ago. Definitely wouldn't recommend it in a raft until you get to RHT. We paddled sea kayaks from Gwood to Fruita. The portage at Cameo sucks. The dam keeper won't let you portage on river right, so you have to drag your boat next to the I-70 on river left. You probably won't have enough water to float a raft after Palisade. As mentioned above, that structure is the last in a series of diversions that basically dewaters the whole river for about 15 miles.
Camping isn't very good, legal, or plentiful, so be prepared to sleep in some bushes. We had to sleep in a swamp around Silt. The section from Gwood to Fruita is almost entirely roadside except for some occasional short bends in the river.
I wouldn't bother doing it again. That being said, there is a ton of cool birdlife between Rifle and Debeque. If you really want to check it off the list then go for it... it's definitely possible... but it isn't a great float. I'd definitely do it in a sea kayak and just try to crush tons of mileage to get it over with quickly and limit how many camps you have to find.
If you want to do a really awesome/long rafting trip, I would try going from RHT all the way through Cataract and take out at Hite. That would be a much better trip, especially in a raft.