Hi, I drive a space tourer bus and would like to put 2 roof boxes (together own weight 39KG) next to each other for the holiday 2025 so that the 600 liters of the large roof box is not enough. My THULE 7107 Evo Fixpoint footsets (4 pieces) and the two SquareBar 150 can only carry 100KG in the pair (my roof may 150kg, so I think with the THULE 710704 Evo Fixpoint footset for roof beams fixed points 2 pieces a third traverse to increase the payload of the carriers so In addition, I only have to buy the mounting kit again in the 4-pack (or does someone have a different idea?) and get a third square bar. 1. does this mean that the third traverse increases the payload of the carrier to over 100KG, so that I can also take advantage of the payload of the roof? 2. does someone know if the THULE 710700 Fixpoint (4 pack) is identical to the 2-pack 710704? The two boxes should be mounted on the 150-pack Traverse pa Eat next to each other. Are together 147cm wide. I would be happy about your constructive ideas. Thank you already.