I want to build a prerunner GM truck SOOOOOOOOOOOOO BAD. I actully want to do it on a 78-91 K5. The ideal starting place I think is a 81 or 82 2wd Blazer. Or if TBI is desired 87-91 44x4 and convert it. Rear end would be at a decent hight and the springs used in the late 80's have good flex. Redoo the shocks and get some remote resrvior shocks and the rear would be pretty good. Loose the 10 bolt and go to a sf14 or a trussed Ford 9.
Full fiberglass front end and rear 1/4's With a Small block they say you can get it down to around 3600lb with a full cage.
GM front is hard. Starting with a GM 4x4 I would be tempted to put a custom front suspension to get some trave out of it. Hate to say it but the ford TTB 2wd front suspension has a LOT of travel and a LOT of aftermarket available.
You can get 35s on the 73 up with just fiberglass fenders. if you don't running the stock inner fenders. I'm sure you could do the same on 69-72.
Some links for you.
www.mkparker.com/goose
http://www.dezertrangers.com/main.php?action=videos
Whole mess of links and that site is also a biggie
http://www.race-dezert.com/index1.html
Herei s a $185K 1974 K5 that can run 100+mph over 2 and 3ft washboard roads.......with the A/C on. WHen ORC tested it they couldn't get out to the desert to open it up so they were jumping it off a loading dock and running over parking ties at speed.
http://www.off-road.com/4x4web/features/1998/11/
Yeah prerunner is gay. NOT
