CRT.5 and 2.2 and/or 2.8 truck wheels and tires????

Have been running my brushless crt.5 for a while and the stock tires are shot. I know alot of people run 2.2 truck wheels and tires, but do you need the fronts of rears??? Or do you need both? I know the stock .5 wheels dont have a different offset for rear or front. Also, would these 2.8 wheels and tires work on the crt.5?? They're 30 series prolines for rustlers and stuff... http://www.amainhobbies.com/product_...-Electric-Rear

I just would like to know if i can run rears on all 4 corners of my .5 or should i run fronts? Thanks in advance!