Tire dilema. Need some help.

[lyrikz]

Currently my truck is running 235/75/15 now. I have a set of rallys that are 15x10. The tires on the rallys are 295/50/15. The rallys sit about 2 inches lower then the 235s on there now. That means when im on the freeway im going to be revving much higher along with being 2 inches lower.

I cant seem to find a tire that can get me the overall diameter that i need. I need a minimum of a 29" diameter tire to maintain what i have now. Not many tires want to fit over a 15x10 inch rim. The 295/50/15s have an overall diameter of 28"/ But when you put them on a 10 inch wide rim, that changes quite a bit...ahaha... I dont want to sell my rallys...

Any suggestions on tire size?? Its going on a 71 stepside.... Im just looking for some advice.