It is best not to start the engine unless you have time to drive your MH for 30 minutes or more. If the oil is does not reach normal operating temperature, it cannot vaporize any condensation/moisture in the crankcase. Moisture in the crankcase causes an acidic condition that is destructive to an engine internally.
If you leave your MH plugged in, the battery charger should keep all the batteries fully charged, and thus in no risk of freezing or cold weather damage. OTOH, if you cannot keep a maintenance charge into the batteries, it would be prudent to remove the battery cables to prevent discharging while in storage. A charged battery will not be damaged by freezing temperatures.
Everything I've said, and so very much more may be gleaned from reading a number of these articles: Winterizing an RV
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"