another place you can lose coolant is the many hoses that run for the different heaters. the one in the water bay, the hot water heater, the front heater core, the one under the bed.
on most of the coaches, they all meet in the bay in front of the water bay in the top of the bay. they all go through there and have "Y"'s there. there are hose clamps on all of the "Y"'s. i did find some of mine seeping, but none losing enough to do what you are saying. to get to the low point the sensor picks up on the top of the radiator will take several gallons. that is a lot of leaking. follow all the heater hoses around, we found a leak on michaels under the engine where the hoses left the engine area.
you are making great progress. you are having cold and we are just getting blow the 90's here....
later
tom
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