The 9005 STD kit will allow you to convert your dock into a rolling dock.
Here is what it contains:
-2x Standards Wheels (9002);
-2x L-Brackets (9005);
-2x PVC spacers (9007-12 and 9007-34);
-2x Cotter pins (1136).
***Welding capacity is approximately 500 lbs***
You will need 1-5/8'' diameter side pipes.