I had a window that wouldn't close in the bedroom. It was pretty hard to get to. Finally, I gave it a semi-gentle slam and it has closed well every since! You might give that a try.
I have advocated dry teflon spray for hinges and joints in the TM. I suggest you get a can of it at Lowes. Be sure it is dry. I just bought a can at ACE HW and it has an oil carrier. You want to not leave something to get gummy and sticky with time. This stuff is great on the leveling jacks. Squirt it in all the hinges, bearings, and on the jack screw. The advantage of the dry teflon is that it doesn't collect dust and grit from the road.
Another trick I use is to carry a white candle. I rub candle wax on all zippers (an old Coleman pop-70 guy, I am) and window slides. It is a miracle on zippers and makes them last years longer as well as open easily.
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