Well I started making a drivetrain Dolly today. I had these 2&1/2" square tube beams with wheels on them that I got from work. They were headed to the scrap bin. I asked I received. These have been sitting behind the shop over 3 years now. Its tme i do something with them. I have been wanting to make this out of these for awhile. I plan on having a sliding piece on the spine to support the drivetrain as i assemble everything onto it.