Answer to why tow on dolly if towable 4 down. In our case want to be able to tow our vehicle, plus three different grandsons vehicles. Our choice is dolly with surge brakes and wireless mag. brake kit. Don't have to buy tow bar, brake package or hookup plate for one vehicle to be able to tow it 4 down. The others can't be towed 4 down, so since have to get a dolly why spend the extra 2000 dollars to get one to tow 4 down. It isn't like we are full time so tow dolly no big deal.