You could leave one propane tank and one battery at home.
You should set the hitch up for weight distribution by either going to the CAT scales (best) or by careful measurements of the front fender height unhitched and hitched. Until that is taken care of you are shooting in the dark.
Easy enough to put some sort of board or support in there to hold propane cover up/on. Or just draw the tank down to empty. Or get rid of the propane tank cover entirely and save even more weight.
Lithium batteries would be way lighter too.
You might also remove your trailers spare tire. That’s quite a bit of weight for something that’s almost never used. I might keep it if I was boondocking in the backcountry though!
I switched my 30# propane tanks to 20# propane exchange tanks to save weight when I had a payload challenged tow vehicle. With full propane, that saved about 50# of tongue weight. If you emptied one of the 20# tanks, your savings would be 70#, or 90# with both empty. Running with tighter weight distribution bars saves weight as some is transferred to the front axle of the tow vehicle and some back to the Airstream axles. I carried everything possible inside the Airstream rather than inside the tow vehicle. I shifted the load around inside the Airstream, putting light items up front and heavy items over the axles. I removed everything possible out of the tow vehicle including tools, rear floor mats, and rear seat headrests. The only addition weight savings I could think of was to go on a diet.
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