Dan, black or gray - they both stink to high heaven. :)
Getting it to/from the campground with the camper- either rear ladder or maybe even on top of the SUV. Otherwise, in the camper door - last in/first out kind of thing.
Getting it around the campground, just pull it behind the SUV. Or suck it up and put it in the back. When I had a cassette potty in my pop-up (which we used for pee-pees only), I'd just put it in the back of the Durango and drive to the dump station. I took it easy and was usually alone in my dumping duties. We generally had to dump it every other day if I was working from the camper or we had a bunch with us or whatnot.