I used Firestone Ride-Rite air bags on my 2008 Superduty and was very happy with them. Even with the air bag, the 2008 stock leaf pack sagged too much and I had to add couple of leafs to gain an inch height. 2008 was the first year with longer springs so hopefully your year has improved...
If you already have the Camco plastic leveling blocks (Lego style) then try them. Honestly though I think that the metal feet built into the jacks are fine as is.
check out various types of “knock down” bed frame brackets. You may get by without too much carpentry skills if the brackets can help your configuration
I have noticed that often when someone has identified a desired upgrade they regret it later if not fulfilled. Partly personal experience too. You have identified added value in some aspects of a full size and you will never put that genie back in the bottle. Then again if you can make a...
Air bags for me were not complex nor failure prone. I did also then subsequently have shop add couple leafs to each pack. Fast forward few years and I just ditched all that and had brand new custom leaf set made for my load/lift. Should have done it at the outset. $1000 for leaf set plus...
Hang in there. If you don't get any genuine interest you can always lower the asking price. Or add "or best offer" to you listing. I like your rig as evidence by the similar set up that I have, although I've got only $45k into my rig. Good luck, and keep camping!
I had loose Anderson connector for my truck camper. For a long time I got by with a cobbled strap that held them together. When I had a chance for closer inspection it turns out one of the plastic housing had cracked. Replaced with new and all is good.