I have the exact same model and year MH (37RB 2017)
I tried a universal class A cover. Hated it. Never really even got it on in the first place.
Also, I got ambitious on a nice summer day and set myself up with a 5 gallon mounted tank in one of the bays and filled with winterize fluid. Hooked the tank to an incoming line to the pump with a valve.
I can now winterize simply by 1) bypass the HW tank and drain it. 2)flip the winterize tank valve. 3) open the main water tank valve.
Seriously less than a 10min job now.
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