Very nice way that you have got all the things you need or may need when out camping. Some people overthink these things, and take a lot more than needed, you seem to hit the right balance. Good job
I noticed in your post you talked about getting a tub for your sewer gear.
HERE is how I store and transport mine leaving no chance of cross contamination
I also have the remote start and boost switches in the cab and a volt meter added to my control panel to monitor my usage. I see no reason to carry a lot of extra do dads or over think things, and spend a lot of money on them, but on the off chance that I or one of my camping friends or any one else that may need help.
I do carry one of
THESE, small but powerful.