R W you might want to take a look here too. On page 17 there's a three view drawing of your truck. Load it on a zip drive and take it to your local copy center and have it enlarged so the axle wheel base is 14.571 and you'll have a drawing you can measure strait off of.
Good luck, she's going to be big!!! 32.5 L x 16" H x 19" W
http://s7d2.scene7.com/is/content/Caterpillar/C637177