Last year, I converted my 35.5 to propane. I got a locker that holds two 10# tanks that I mounted on the stern rail on the port side. Not, in my opinion, the greatest location, but the best I could come up. If one goes with a different number or size of tank(s) you may find a better location. Along with the other items mentioned in a previous post, I also installed a gas detector that was part of the controls.