I first fill the plumbing and hot water tank with water from the City Water connection to "prime" the plumbing and purge most of the air out of the lines. Otherwise the pump has to run and run and run before water starts showing up at the faucets from the tank. You might be able to pull nearly all of the water out of the fresh water tank once the air between your tank and faucets has been purged.
2014 Micro Lite 19fd
2015 F-150 5.0L V8 XLT Crew Cab, 4x4, Tow Package, 36 gal tank, 3.55 locker, 1891 payload, Integrated Brake Controller, Roadmaster Active Suspension
Wooden Spoon Survivor