Hi Harry
Here’s the layout for my trolley. Some of the dimensions and sizes are a bit odd, because I used up as much leftover steel as I could. Overall width of the black frame is 1500mm and the length is 2300mm. The second dolly I made was the same width, but shorter because I ran out of steel
Attachment 34698
The black “T” frame and the cross pieces on the far end are all 90mm x 90mm square hollow section
The silver castor/stand sliders are all 100mm x 100mm square hollow section. There is about 4mm clearance so all parts slide fairly easily.
I drilled 5 holes in each of the silver sections at 40mm centers, then lots of holes in the black main frame at 50mm centers. This allows each sliding section to be moved 10mm before a set of holes align, so basically any part can be positioned to within 10mm.
All the sliding sections can be reversed by knocking off the end caps. I did this to support my open wheeler at the front, the two stands can be as close as about 200mm apart.
The cheapie car stands (Supercheap brand) were $19 for two, and saved a heap of fabrication time. I tried to line them up directly above the castors so there aren’t any “tipping over“ forces.
One mod I have made from the above picture is to replaced the two fixed (non swiveling) castors at the near end with swiveling castors. The castors came in a four pack, two fixed + two swiveling. Cheap, but a pain in the …… Four swiveling castors makes it much more flexible to reposition. Castors were bolted to a drilled/tapped 10mm thick plate, in turn welded to the sliders
Attachment 34699
Length was 300mm, 5 holes at 40mm centers starting 50mm from the outside end. The holes aren’t exactly on centerline on the silver 100mm x 100mm SHS section because of the clearance between the 100mm SHS and the 90mm SHS.
Attachment 34700
The center slider length was 380mm with 5 holes at 40mm centers starting 50mm from the end.
Cheers
Tim