if the vent is the problem I had a similar problem several years ago. I put a boster fan in the vent as close to the dryeras i could. Picked up power from the washing machine plug. Turn the fan when you start the dryer. I never had another problem.
i have built a half dozen trailers. 5x8 to 8x16. used 2x6 treated for all the decks. All but one were hls in place by welded angles. The last one I built I bolted the angles on with 3 1/2" bolts each.
The batteries in my Golf Cart are from Sams. They are 5 years old and still going strong. I do check the water once a month and only use distilled water.
Things are different for different people. Thought I had to have a set of crows foot wrench. I have used them twice. Ratcheting box end wrenches have been used maybe half a dozen times.