Hmm. As extreme as you and your friends are down there, I think I have solution to your problem. It's a 6x6 flat bed. And you'll never have to worry about saggin this ones wagon unless you find something over its factory rated 120,000 lbs suspension. That'll get you guys anywhere you want to take your stuff and have fun getting there too.
Hahaha I have a military convoy to use 6x6 too. I use it to take a 48' yacht out of the water.
---------- Post added at 10:39 AM ---------- Previous post was at 10:18 AM ----------
Does carrying weight will cause more heat to the suspension?