"The closer the furnace is to 100% run time the more the comfort."
"With a larger furnace the tank heaters become even more necessary."
Huh? :h
You are going to have to help me out with those two statements. I would have to argue that a larger furnace that has to run significantly less to maintain the same temperature, in addition to being more efficient will generate less noise (a part of overall comfort).
A larger furnace, generating more heat, in no way necessitates a greater need for tank heaters. Most folks just crack the cabinet doors or a drawer or two to facilitate the abundant warm air's circulation. If anything a coach with a larger furnace might be just fine with no tank heaters.
I have tank heat but have yet to run it as the large (35K BTU) furnace keeps our little 24' C so toasty with minimal run time. On a typical night below freezing the furnace only kicks on a few times for 5 minutes with the thermostat set at 65. Less furnace is a problem not a solution.
As always.... Opinions and YMMV.
:C