I like this thread. Last weekend on the way home from NWOR in Plain, WA we took WABDR stage 2 from north to south.
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As you can see I have some 80 series wheels on there. Good idea at the time when I had an 80 but now with the 100, I don't have the like spare. You might can see a spool of wire too. It's for the LED lights underneath the trailer rack and in the awning. I need a better solution, like a coiled wire that allows the rack to extend up, but for now, I just use alligator clips to a motorcycle battery. I'd like to build a portable house battery box for the trailer. Something I can remove when the utility part is needed. I'm thinking a box with some switches on top for lights in awning, trailer bed, and in the future annex and tent lights. This might be wishful thinking, but is there a way to charge a battery from the trailer wiring? The 7-pin style wiring?
I have this same issue. When I got back from this trip was the worse. In my chuck box, everything was covered in steak sauce when the bottle broke open. I took it easy on the trail and bigger bumps but the trailer still jumps around. 3500# axles. Maybe I should take a leaf out or try different leaf springs like you. Did you have to move your mounting points?
I had this issue as well but it wasn't cold. I don't have a regulator in the line I was trying to use for the stove or the propane fire pit. Not sure if that could be the cause or what, but there was no gas to either one and it was a full tank.