I have the Mule Trans 4010. It will fit a pallet in the bed with the back seat folded up. It's almost always folded up, but it's really nice to have the second row of seating when we have friends over and we're going back and forth from the house to the pond. Same thing when we're showing friends that are visiting and we take them on a tour around the land.
A while ago I went hunting down in Sonora Texas with my wife for free range Sika and Axis deer. The ranch was 4,000 acres and the outfitter had just bought a brand-new Mule Pro. At that time, it cost twice what mine did, but it also did twice what mine can do. Seats 4 comfortably, and we would drive 50 mph down the paved road that went through the ranch, then go over some of the roughest, rocky, cactus filled ground possible looking for animals. While my Mule is great at what it does, there is no way it could do what the Pro did. If I had the acreage, I would pay the extra for the Pro. Or at least look very seriously at it!!!