Jim - That link shows placing the 2x4s at the ends of the top, with the bottoms of the boards over the frame. That will certainly work. I've placed my 4 boards on the two "endmost" outriggers (my trailer actually only has those four anyway), which gets the support nearest the ends. I doubt you would need a board on the middle outrigger on the curbside. I guess, since you have a 28 ft trailer, that middle outrigger is there to help support the somewhat weaker area near the door during travel.
- Jack
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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System, SoftStartRV mounted on A/C
2024 F150 Platinum FX4 3.5L PowerBoost SCrew
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