51: Have 59 cab sitting on home made dolly. Materials= 4 cast iron rollers found they turn 360 degres, 1 4x4 cut to 48" , 2 2x4's cut 59" bolt casters to 4x4's nail and square 2x4's to end of 4x4's sit perfect under cab. Easy to roll and work on everything but very bottom will cross that bridge when I get there. popcorn The Truth is Out There (IT WORKS)