I got the upgrade to the mid-level cart. The tires are wider than standard but not as big as the largest ones. Except for very soft sand, I think the mid-weight is about right.
BTW. there's no way the supplied set-screw spacer will hold the weight of the PA and keep the keel off the cart axle. I measured and cut PVC spacer rings about 3/4" wide and slipped them on the uprights, then slipped down the rubber bumper supplied with the cart. (I cut rings of 1" ID PVC and then sawed a straight connector in half to fit snugly over the pipe rings.)
Here's how the spacer sits, looking from "below". Axle, spacer and factory bumper.