If you do any no sewer camping you are going to need a "blue boy" type tote sooner rather than later. Lots of advice about size.
My thought process is like this:
When I do "chores" I want to do it quickly and as cleanly as possible. GRAY water SMELLS almost as bad as black water. You are STILL going to want to dump black tank first (went it is near full) so you need to plan on washing out the dump hose connectors with gray water and will need room in the tote for the hose flush water.
I have 40 gallon tanks so I bought a tote large enough to take a near full black tank and a few gallons of hose flush water.
The ABSOLUTE LAST thing you need is a full tote and hose with black water still in the plumbing! Trust me on this ...
I mounted mine above the rear bumper. I know it is not the best solution, but the mounting frame and plastic tote only weighs a few pounds and if mounted securely applies almost no "leveraged" stress on the welds.
I also replaced the stock wheels (hard plastic) with pneumatic rears and rubber fronts as they area LOT quieter when towing/pulling to the dump station. The side discharge means I do not have to lift a full tank (HEAVY) at all.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW