Spyder before you buy the Harbor Freight dollies make sure they will support the weight. I got some for my SA Boat mate and the dolly wheels literally rolled outward under the weight. They were rated for like 1000lbs per dolly I believe, they are toast now. I was only rolling them a few feet sideways like you want to but over the winter they sagged. A DA trailer might distro the weight better but I wouldn't think much more per axle. I now have a set of the higher dollar jacking roller dollies and the weight appears to be almost too much to raise the SA up and the overall supports look shaky as well. You might have to go high dollar to get something reliable.