My 18LT Work and Play has a 3/4 inc solid plywood floor. My tanks were not in the way when I installed tie-downs. Not much help, but will maybe tell you about the floor you have to drill through. As for lowering the tank, mine, as most, are held by straps. Just remove the straps, and gently lower, watching sensor wires and water hoses. Use a board on a floor jack to help steady things. Good luck. You'll have to check bolt clearance when you re-install.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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