RonHr,
As Nash said Dutch Star and their manufacturer (NEWMAR) have a great rep. Nash provided other good gouge to look for in his post.
There is a 00 Dutch Star parked across the POD from me down here in South Florida and the owner raves about it. On my morning walks I see multiple Dutch Stars throughout the park all years. I will sniff out any 01 owners in my walks and see what they have to say.
Hoepfully the owner has maintnance records and you can find out what type of transmission fluid is in it Transynd or Dextron and also find out about the coolant. Run every thing fridge, AC's etc. Most likely have the old 4 button Duotherm CCC thermostat which is not a problem just remember parts are not available but a rebuild if their is a problem runs about $100. Tires are an enigma 5-7 years at best and your looking a 3+K to replace. Find out age of batteries also. Goal really is that when you drive away you have little or no expense right out of the blocks other than fuel to take you home. If it has a washer/dryer combo and the moho has been layed up make sure that was winterized also. Concerning engine both Cat and Cummins make a good engine and if need be you can send an oil sample in for analysis to Blackstone Labs or Amsoil if you desire to see if any problems exist.