A little more info would sure be helpful. Here's 3 questions that answers to will help get you your answers.
1) Does your RV have an inclosed belly with heated fresh water, black, and gray tank heaters?
2) Do you stay connected to the campground water source?
3) Are your waste valves in the enclosed belly or out in the open?
I have broken water pipes twice in 18 degree overnight weather when I owned a Winnebago ERA, class B which had all the plumbing running under the unit. I've camped in 3 different class A diesel pushers with heated tank areas for weeks on end in temps in the teens and never had a problem. So the bottom line is--are your pipes/tanks protected in an inclosed area with a heat source.
Days camping (2015)----88 days
Days camping (2016) ---110 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi
30 years RV'ing
12 different RV's