When you use the term "dry camping", do you mean "there is at least a pit toilet within a couple hundred yards where I could dump the load"?
Or do you mean true boondocking, as in "I'm out in the wilderness with absolutely no facilities"? In that case, you have to get the full tank to a dump station somewhere, perhaps miles away - or take it home. And then muscle it to the dump point, which may be raised above ground level.
If you mean the former, then a smaller tank will be a lot easier to deal with, and I would highly recommend it, even though you have to make more trips. For a few years, I used a 6-gallon Barker tote. Even when full, I could tow it by hand, on the ground, and man-handle it up to the needed height at the dump location. I stored the empty tank on the spare tire rack, next to the spare tire. Some folks bungeed it to the trailer A-frame, and some to the rear bumper. Easy.
If you mean the latter, then you will probably need a ramp and a rope-and-pulley to get it into your truck. Unless you have help, you are not going to be able to dead-lift any more than about 10 gallons (100 pounds or so) from the ground into the truck. And don't forget that once you have moved the full tank to the dump location, you may not find a ground-level receptacle. You may have to lift the tank 18 inches to get it high enough to dump, and then hold it there while it empties. Very hard!
Especially if you decide to go big, you might consider getting a 12-volt macerator pump and a motorcycle battery or 12-volt extension cord. This would allow you to load and unload the tank while it is in the truck bed, without much effort or help. Assuming you have a truck. I'm not sure I would want to load a wet tank of sewage into a mini-van or closed-cabin SUV. And I know my wife would not be enthusiastic.
Bill
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