You also need to factor in the fact that if you're staying in Motels, you're going to be pretty much eating at a restaurant every night. With a camper you have a full kitchen.
Having spent 53 days traveling around the country not this last summer, but the previous, I can say with out a doubt I would not have wanted to do it living out of motel rooms. Having to pack and unpack the car every night, living out of a suitcase, and sleeping in a different bed every night would have gotten old real quick. With a camper, you have all your stuff stored in the camper, closets for your clothes, and a bed you can get used to. We got pretty good at hooking and unhooking the camper, we had it down to under 5 mins.
The best part though, if you really need to use the bathroom, there's no searching for one, you're hauling one around with you. Just pull over and use it. If you think they're easy to find, your coming from a coasters perspective. There are still vast stretches of this country that have nothing in them but a road, running straight and true for miles and miles and miles and miles and...