Mac.
Here is a link to a good article on looking at pre-owned H1's
http://www.amghummer.com/features/gas_vs_diesel.html
This site is also an excellent reference for H1 info.
Be carefull when looking at pre 97.5 H1's and if possible get a truck with a factory warranty.
Hope it helps.
2001 H1 Opentop
Former 03 H2 Adventure Series
http://homepage.mac.com/babiak1/