Knuckles are only good for very hard pack surfaces. The knuckle 2.0s are better then the original knuckles but if you have even just a thin layer of loose dirt ontop the knuckles get a little loose. You wont have as much tire life but try the crime fighters. The track I run on is hardpack clay with a small layer of dust ontop and they hook up pretty well. Moabs are very good all around tires and they seem to be hooking up well on the local track aswell even though I never tried them. If the track has a very very thin layer of dust ontop then go with the cell blocks. Side bite and forward bite are fantastic as long as the dirt isn't too deep but they don't last long at all because of the micro size tread on it. My best recomendation are crime fighters. Close and shallow tread patterns are for hardpack only and spaced, deep tread patterns are good in loose dirt.

Rims you do need to have the correct hub offsets but they are all pretty close and I never had any offset problems running the proline rims (only tried them on a kyosho MP777 and hyper PBS). Tires size is all the same otherwise.