Not sure if this is the right place to post this.

I have a 2009 f150 xlt stock hight withs stock 18s im looking into getting gear alloy manifolds in 18x9s with offset+18 with stock 275/65r18 bfg ko2 or fuel gripper A/T or to a gear alloy 20x9s rim with offset at 0 or -25 with a bfg ko2 tire size 275/55r20 will the 20s on a stock truck or should i just stick with the 18x9s