I have the mini e-revo so im not sure on the summit... I dont know how that thing is for wheelies, but on the e-revo a wheely bar is a MUST!, body clip retainers too!.... I dont think I would go bigger tires, as for the rockers, that part is differnt from the revo too, I think the summit has more progressive rockers, which are better for low speed with more wheel action, the regular ones that come on the e-revo are better for high speed stuff....
I wish the summit had come out at the same time as the e-revo... would much rather have that one.... as it is im going to just have to upgrade mine.... as soon as the tires on my e-revo wear out, im getting some summit tires and rockers, and maybe the body too, but im pretty happy with my raminator body....