Hey Guys,
Sorry to hear of any misfortune you may experience with your CRDs.
I'm new to the the VM experience as of November, and my first Jeep before that, an '02 Liberty- earlier last year.
Both had blown engines. Although the '02 has the 3.7, (a "folley" all its own), both it and the CRD are the absolutely the easiest, straight-forward vehicles I have ever worked on. And, I had absolutely no trouble finding parts for the VM, all the way down to head gasket, rocker-arm/lifter assemblies, water-pump, etc... and not all that pricey, really, in comparison to whatever else you're driving these days of similar age.
Other vehicles I have owned:
2008 F350 Longbed Crewcab, V-10 gasser with 4:30 gears and 8 mpg no load- whew! Remember ga$ price$ in '08???
1985 MB 300SD, (5cyl Turbo auto) 4-door, boat-like ride, 26.5 mpg always, good luck searching for some of those parts!
1975 MB 300D, (5cyl, Non-turbo automatic), not so exciting, and all it was good for was parts!
1979 GMC 1500, 5.7L Clunker-Diesel. Nice riding truck, got about 22 mpg, tons of problems and sold it.
1968 Mercedes 220D, 4-cyl, no turbo, 4spd manual. 32 mpg. Best overall production vehicle ever to roam the planet.
I have found you will never find an easier vehicle to obain resourses and advice on than a Jeep either.

L.O.S.T.
You're all a great bunch, and it's a privelage to be with you here on the site!
Special thanks to Keith at G.D.E. for his "support".