I have been in my MH for just that reason.
1) What about hook-ups? You will need electricity, water and a place to dump your tanks. I stayed at an RV park with a monthly rate until I just moved the MH to the house we purchased while carpet gets installed and we get it fixed up.
2) How many in your party? We are two adults, two kids, and two dogs and our 345 got awful small awful fast! When I was solo in September I had more room than I needed.
3) PL gas and the furnace. Denver.....winter......COLD! You will run through some LP gas assuming the old furnace in the Argosy still works. That's a trip to get LP gas on a regualr basis. The furnaces in the Argosy units vary since Argosy was a test bed for Airstream and the units are old and owners might have replaced them. The gas forced air furnaces do put out lots of heat. You will need a carbon monoxide detector to keep from killing yourself if the furnace isn't sealed totally.
4) The dent - is probably in the galvanized end cap. A shop MAY be able to fix it. Did it damage the inside wall?
5) These handle great. The steering may need parts repaired but they usually ride great. The 78 and 79 models have the air ride suspension.
6) RV fridges are expensive. You do have a Camping World in Denver for you to spend all your money at!