Questions for Nexus Owners

I have a Nexus 28P and the dry weight was at 11,000 lb's. That would give me 3500 lb's. to carry before going over the 14,500 range. I have not weighed it at all 4 corners. I had them install a spare tire carrier under the rear of the unit. I had 3 flats on my previous MH, and would like to think that I can change a tire myself, if I ever have another flat. I went with the "no slideout" 28P but now my wife and I are thinking we need to upgrade to something with a slideout. I would consider going back to Nexus if we do get serious about getting a new unit.