The 7.3 is great and might be one of the best produced motors of all time, but the one and only problem is that they are all in trucks that are coming up on 20 years old. A buddy of mine thought the same thing and bought a 2002 5.9 cummins with 1750000 on the clock and it was clean as a whistle, original powdercoat still in perfect shape on the frame and you could still read the stamped markings on the rear leaf springs. He bought it thinking it would give him hundreds of thousands of miles no problem. With in a year he put a clutch, u-joints, ball joints, brakes, wheel bearings, and now his fan and radio don't work from some electrical bug in the wiring harness. Could just be a dodge quality thing I guess, or things just wear out.
Have you thought about doing a builder, finding a truck that was wrecked and rebuilding it with a salvage title. You can get a newer truck for much less money.
Trikes Owned:
1983 Honda 200x - Durablue Axle
1986 Honda 250r - +2 westcoast
1984 Honda ATC 70 - Piranha 140 swap
1983 Honda 200e - Stepdads