Marty, welcome to iRV2.com. We are glad to have you join us here and we look forward to reading of your adventures and experiences in the future. Until then, I am sure you can gain all the information you are seeking from our members. I am sure you will enjoy the website and forums.
If you do a search on the main forum page for the key words, like "winter" or "winter camping" or what ever subject you are researching, you will have access to many threads that have discussed these issues. Also look around the main forum and see all the different sub-forums for ideas as to where best to ask for new information or make comments. Don't worry if you put it in the wrong or not as good a forum as possible, we can and will move it for you.
All DP's will have heated storage tanks of some sort. Take your time, research first the way in which you will want to use a coach; ie, full time, boon docking (off power grid) and which floor plans you like most. Then after you have narrowed down these requirements start looking for coaches with the floor plan, equipment and systems you will want. From this list of brands and models you can go to those owner forums to get feedback as to the pro's and con's of each. Good luck. Enjoy the hunt and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7