Those running a JAG rear... driveshaft/diff joint location.

[T-Rex]

I'll no doubt put a good piece of steel plate under the seat and perhaps a driveshaft loop or two. Mine should be in the ballpark length wise, around 18". As for 'spinning the tires', not sure how that will go with somewhere around 450 hp (at the crank) and Mickey Thompson 33 x 22 x 15 Sportsman S/R's.
Fun times ahead.

[Kevin Seward]

The hp number you show will be plenty. Hitec T doesn't have near that and when I had the Hoosiers 33 - 21.50 it did just fine with turning them. Now with M.T. 31 - 18.5 it still isn't a problem.