My brother is lookin for more aggressive tires for his 06 ranger base model (coil-spring suspension). Just checking out craigslist and hes finding tires here and there to put on the stock wheel. He found a set of EDGE stock wheels hes gonna call about tomorrow too. I found someone selling 31/10.50/15 "mud tires" (im assuming he means all-terrains judging by the pics. A few questions...

-how will the 2.3 d-tec run the truck with 31s?
-will the stock EDGE rims fit right on the base model with no backspacing issues or anything like that?
-will the 31/10.50/15 wheels fit on the stock base model rims fine? What about the stock EDGE rims?
-Will the 31s even fit without needing a lift or anything like that?

thanks for any help, guys!