You might want to check other forums. For example, my class A carries 150% more water than my old truck camper did and you don't even feel the weight in the class A with its centrally mounted tank and auto leveling suspension. In the truck camper I had the holding tanks were behing the back bumper under the 4ft out the back overhang. When they were full the vehicle was not very comfortable to drive. I was much more concerned with finding places to dump while driving it. Many small campers have even more limited water facilities.