OK, I just picked up an 06 F150 XLT Scab 4x4. It is all stock and I want to upgrade it a bit! So I was wondering about Tonneau Covers. Is there any advantage to them? What kind should I get? I have do have Line X in the bed already. What other things should I think about getting? I know I want nerf bars for sure! Any good brands? Oh what about helping fuel milage without sacrificing power? I use to have an 01 Ranger but this is my first F150 and I have had it only 2 weeks! Thanks for any info to a F150 noob!