Cheap Ford Focus Wagon will fit any pin except the stupid tall Gottlieb Sys 3 pins. I easily fit in a STTNG with the head on and folded down and you will have room for a cart and front seat passenger. Also it is low to the ground and easy to load. The car is cheap and parts are everywhere cheap. The only downside is that it is a Ford Focus Wagon, so it will never be a real joy to drive and you can only fit in one pin at time (at least without really taking them apart).
If you plan on hauling more than one pin at a time I would look at a mini-van of some sort.