I lean toward heavy haulers. This makes my Savage Heavy Hauler my favorite. I think there was about 20 of these units made. Allen Smith was the maker. The model came with a video tape of the move and what went into the making of the trailer, and the problems that they encountered during the move. It has a tractor front and back, plus four more at the rear, side by side. The rear tractors were more for breaking than pushing power.

My choice would be the 4100W. Despite it being detailed, it is still rather "playable" as a crane, especially using it to assemble other crane models etc.