Needing a new set of street and trail tires, I want to stick with around a 33" street tire, but don't know what to choose. I don't know if I should go with a skinny (255 or 10.5) or a fatty (305 or 12.50). I don't know whether I should get an all terrain or mud terrain. And I don't know which set I should put on my 15" or 16" rims. I know I want a 36" trail tire, but don't know if I should save the 16" for some military Michelins or just get a set of 15" tires. My "street" tires may also see some light trail use, or emergency/spur-of-the-moment off-road situations. Thanks in advance although I know most of this is repeat reposted aggrivating material, but the rim size choice is a tough one.