I measured my '70 the other day and came up with 40" from the center to the widest point, plus a little fudge factor to keep my BP down.
You gotta add probably at least another 12-20" to that in order to account for the mechanism of the rotisserie.
I'm planning on the accessible systems 1500 or 2000# unit. I'm planning on optioning the adjustable height and the pneumatic tires. Prolly around $1150 + shipping when it's done.
http://www.accessiblesystems.com/bul/bul15.htm
Thing is built like the proverbial brick outhouse.
What are you looking at.