mtofell1 wrote:
I can't imagine trying to swap out tanks. It's very likely that the reason they are the size they are is due to space constraints.
Have you looked into gray water totes? They range from small ones that you pull to big ones that you can attach to the back of your vehicle to roll to a dump station (or at least away from your neighbor :)).
I've toyed with the idea but most of the places we camp font have a close sewer dump, I've thought about putting a 50 gallon tank of the pickup, and pumping out to the pickup