Is there an easy way to fill JUST the hot water tank? The tank is currently bypassed. I'm thinking of opening the trailer and un-bypassing the tank, connecting city water, and using the outside shower (Jayco 1007) to open just the hot water faucet. That should fill the hot water tank ONLY, correct? * Reasoning: I hate filling the main water tank and then taking 6 gal from it just to fill the hot water tank. I find we run out of cold/tank water in 2 days and usually camp for 3. I want to fill both and/or just the hot water tank before setting up the trailer at the campsite.