I have a Nimble Artic sail boat. The first time I took her out and tried to land in a cross wind I broke the guide poles off the trailer.
Now I have replaced them with Vevlor 60" Guide poles
Vevlor Boat Guide (https://www.vevor.com/boat-trailer-guides-c_11930/vevor-boat-trailer-guide-on-60-trailer-post-guide-on-w-tube-cover-led-light-p_010359671240)
The guide pole kit ships with short U-bolts, too short to go around the trailer rails.
So I made this bracket assembly to make it work.
(https://www.cruisersforum.com/attachments/gallery/1/0/2/0/4/1/07topview02.jpg)
Drawings and photos are here:
GitHub Bracket Files (https://github.com/tbodine88/VelvorBracketNimbleTrailer)
Let me know if you find this useful.
Happy sailing Capt Tom Bodine