Welcome to iRV2. It all depends on how long the coach will be with the front wheels off the ground. If it is for a couple of days (loading and unloading), for me, it is not a problem. If you are going to leave it this way for an extended period of time, consider finding a way to keep some weight on the tires. Never let the rear wheels leave the ground. At the Tampa RV Super Show (January 2015) Spartan, Freightliner and Ford said the same thing.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours