I took this Sears motorcycle jack http://www.sears.com/craftsman-motorcycle-atv-jack/p-00950190000P and modded it to use as a Pinball Dolly.. Like in the ad, the jack was on sale for $89 bucks when I bought it.. I also bought two Fixed ( non-swivel) 4" wheels and two 4" Swivel wheels.. Some clamps..
Here's what I ended up with.... And I also through some 2x12 together, because the jack only wouldn't lift high enough... It works !