I have a 3 year old blue and a red. Completely different body types, dozer ( the red one) is the shortest strongest out of the two. Dozer can pull a little under 3 tons and Lola is at about 2 tons. Can someone please tell me how they work there dogs out because it seems like were stuck. Also, what did u make, use for your home made practice work out sled. Mine sucks and I need a change. The dogs deserve it. I was almost arrested the other day for dozer pulling an avalanche loaded with a pallet of cinder blocks. Thought it was cruel. Dozer loves it. Guy was a douche, he had a bsl bumper sticker on his patrol car. Douche.