We have been using Plug and Play wiring harness for over 7 years and they work that well that they are now the industry standard. All plugs are compliance tested for use in saltwater. And if you happen damage a tail light or clearance light it's a quick change over not a major rewire.
Centre Roller Posts
The industry standard is to us 19mm solid posts for centre roller brackets but at Seatrail Trailers we use 30x30x3mm Tubing and reason behind the use of tube instead of solid square is solid square bar tends to vibrate down over time as you are relying on the friction between the post and the end of the bolt which doesn't have a lot of surface area.
With hollow tube when you tighten the bolt against the tube the bolt dents the tube which creates a much stronger clamping force and makes it nearly impossible for it to move.
Two Year Frame Warranty
Seatrail warrants that each trailer and its fabricated steel components, including the ball coupling to be free of structural or welding defects for a period of two years from the date of original purchase. Tyres and tubes are excluded.
Seatrail Warrants that the trailer LED lighting, rollers and skids, u bolts, nuts, bolts, mechanical braking equipment, axles, wheel bearings, seals, bearing buddies, tyres, jockey wheels and winches are fit for their intended purposes.
Seatrail will repair or replace any items covered by the above warranties provided that the trailer is returned to the authorised distributor or a Seatrail dealer within a reasonable time after the defect is discovered and in any event, no later than 2 weeks from that date.