Not sure where fort lewis is but even the supposed 4 season rigs are pretty limiting if you are in snow country and 2 people and large dogs are going to be cramped living.
As far as purchasing...spilled milk situaiton...the loss is already there, you just prove it when you sell. If you think you can fix the worst of it with some remodeling, you might consider it but do a professional job without anything too strange (ie: built in dog kennels or other oddities) or you will knock that much more off the resale if it doesn't work out.
A big quesiton in how you proceed is did you make the mistake of financing? If no, I would sell and buy something more suitable for a lot less money. If you financed, that may not be an option unless you have some sizable cash reserves to pay off the bank.
