Shocks Dave Updated October 17, 2019 23:36 Follow Which replacement shock do I need? If you have a 66" trailer (PN 800810) you will need our standard shock PN 8880177 If you have the 78" trailer (PN 8008107) you can use either; The standard shock PN 8880177 The Heavy Duty Shock (HD) PN 8008110 these will increase the weight capacity from 250 to 350 lbs. If you need additional help please contact customer support here, or by phone at 888-925-4621 during business hours. Related articles What size Bearings do the Wheels Use? Trailer Replacement Parts and Instructions What is the recommended speed limit for the Rack and Roll Trailer? How long of a Kayak can I carry on my Rack and Roll Trailer? What is the optimum height for the hitch to tow a Rack N Road trailer? Comments 0 comments Article is closed for comments.