Grizbear,
I'm not a hitch expert by any means but unless you were already marginal on your hitch setup, I wouldn't think 36 pounds would make a significant difference with your 25' AS tongue weight. I can get as much weight fluctuation that you're describing depending whether my propane tanks are full or empty and I don't notice any difference. There's plenty of posts on hitches so maybe you could find more info as to that possibility.
Is 3 miles enough to warm up the tires to soften the rubber? If not, that might give you a little rougher ride initially. Speed and temperature can impact how quickly your tires will warm up. If you were putt putting through town, the tires might not have been fully warmed up. What were your temperatures in AL when you went to the shop? Could you have been feeling that little flat spot on your tires from having it sit awhile when it's cold? Maybe a tire expert might chime in and give us a better explanation.
Another thought; I'm guessing you are normally loaded down when taking the AS out. An empty TV and AS will ride a little differently than a loaded up one.
Road conditions might have given you false indications. Even though you may have backtracked the same route to and from, some roads are a little more bumpy on one side than the other.
My only other thought would be you might be subconsciously worrying about the added weight and you're being more critical than normal. I do that a lot! Might try getting out on the road for 30 miles or so to see how things feel after a longer drive.
Hope your 6 volt batteries work out okay for you. What brand did you go with? Did you have to modify your battery box? I've thought about doing the same with mine but not sure I can and still be able to get into the front storage after modifying the box.
Good luck!
-Wes-
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