I'm looking at a few older 5th wheels, and I'm having issues finding out the info I need. I need a 4 season, live in unit. We are planning to build a house and need something to live in in the interim...
You won't find a number for Excel because they went out of business.
What you're looking for is a winterworthy RV, meaning that you can survive in the winter in it. It'll have all fresh and sewage pipes, valves, and tanks in locations that are insulated and heated.