TERRY - Welcome to IH CC.com. For what ever reason these old CC's seem to spark "Creativity". There's been several tandem drive axle CC's made. Been several yrs since I've seem pic's but I think JIM CHABOT, long time CC addict worked on building a CC grader, seems like He had a pair of K241 Kohlers, straight pipes, Hydro rearends of course, He had the engines timed together so the firing order was the same as a Harley. Last pic's I saw was of the first test run, haven't seen anything since and not much of Jim here for a couple years.
Also, can't remember who it was but someone built a tandem axle dump uility vehicle like Your working on. Seems like I remember a pic of it heaped up with firewood or something and it not being able to turn because the frt wheels were off the ground.
I've been hauling rock & dirt lately with my 982 & Pronovost dump cart. I hook the cart to the 3-point, not the normal hitch plate, and it pulls a lot more weight off the frt wheels, I had them a foot off the ground a couple times last week. Good thing I have steering brakes so I can turn, even on smooth concrete the frt tires just skim the ground and it won;t turn!