Wagz--I don't know about the engine stand you've got, but mine is only a couple feet wide, and the rear wheels don't swivel--you get one on each end and the thing won't turn
If you look at my home-made rotisserie, I made "bases" that are 4 feet wide, then used swivel casters under them, so I can go any direction I want. From what I've seen, you probably wouldn't want to follow my design to the letter, because the damn thnigs are heavy--I was just over-engineering things in an effort to be safe (and paranoid)
Good Luck,
Jim