In the Grand Canyon you can stay at Trailer Village and leave your fifth wheel hooked up for A/C for your dogs and use the bus system to get around. You can use your TV in the village and out to the east. There is a campground convenient to Arches and Canyonlands, Arch View Resort RV Camp. Again you can leave your dogs in the A/C in the fifth wheel and travel via the TV. Of course, you have to feel comfortable leaving your dogs in the fifth wheel.
Traveling between Arches and the Grand Canyon you may want to stop by Antelope Canyon which provides an opportunity for some unique photography. You must use a tour company or the tour offered at the canyon. You cannot go on your own. It might be wise to make reservations for a tour in advance if you go there. The tours on site tend to back up by several hours.
We traveled in that area this past summer and you can see where we stayed and what we did in the blog "Arches, Geysers, and Canyons" in my signature.
We are not hikers so there will very minimum hiking in our trip.
