help with laying frame on s-10 x

Hi guys n gals as you all can see I'm new to this fourm and I need a little help with laying frame on my 2002 S-10 Xtreme. I know of the road grater system and I plan on using it but, my problem is that I have already bought 20 inch rims for all corners. I understand that the road grater system is made to lay frame with 18's on the front, 20's out back. I have come up with a plan with a worker from a local shop to lay the front down also on 20's. My problem is I need to move the tank that is under the computer on the passengerside of the truck. I plan on relocating the computer where the battery is. Where do you guys suggest moving this tank to or can I do without it? This tank is my only problem and any advise yall can give me will help alot. Thanks for your time.

Not sure what tank your talking about. But to lay flat out you'll have to remove the front fenders, you may also need to do some cutting of the bed to allow maximum room for the 20s in the rear.

Yea I know about the fenders, thats why I need to relocate this tank. I think it is for coolent(sp?) I don't know though the fluid inside is red if that helps any.