My 2000 VNL770 looks nearly new and had 438K miles on her when I purchased her a couple months ago which is considered low mileage for a 2000. From my research most 2000's will usually have between 525K and 650K on them.
BTW, these trucks are good for a million plus if they are taken care of.
For anyone intrested in a class 7 HDT that's ready to hit the highway as a toter check out this Web Site =
http://onezman.tripod.com/
If your interested in locating a truck on your own and either doing your own conversion or jobbing it out Larry Z "above" also has a good publication he's written on converting a class 8 HDT into a class 7 toter.
Here's the Url for his publication which is in the form of a download =
http://onezman.tripod.com/yourrvhaulercom