I have an under the seat 18 gallon marine tank strapped down on my slide out tray. As far as the gas caps I used truck tire valve stems with the rubber gaskets on both sides and the nut, no need for glue, eliminating the possibility of a leak. Make sure the hose you select is "gas line hose". For the parallel kit, I made my own for about 20 bucks, cut off 2 heavy duty short extension cords, a 30 amp receptical and a water tight box. Ive used this setup for 4 years and it works great. Most of this info, including pictures, is available on the internet if you do a search.
Bill
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