It's probably near rock bottom for a running diesel Class A, and having all maintenance records is a plus, since it indicates the owners CARED enough to keep the maintenance up to date. The NADA guide isn't much help on an old rig like this. Depreciation has long since bottomed out and condition is everything.
The lack of the original generator is a negative, price-wise. If you want the capability to run two a/c's off the generator, you will need 5000-5500 watts capacity, and that is serious cost. A pair of Honda 3000i's (see below) would run around $4000.
A stand-alone genset will substitute nicely for the original. A pair of 2000 watt Hondas would be a good solution, allowing you to run one for routine uses and pairing the other with it to run an a/c. If you want to run both a/c's off the genset, you need 5000+ watts, so maybe a pair of Honda 3000i's. If you don't run without hook-ups often, perhaps just occasional Walmart stops or lunch breaks, you can do with less.
