We had tried the brckets that came with our 270 awning and we had hinge sag at both ends but particularlay the front. We decided to go for overkill and use 4 of these adjustable brackets. We did this because there really isn't a long enough roof rack on the market to take the weight over the span of the awning. We had bought the largest which is 2.2m long. Also it is fairly cumbersome having to mount the awning then take it off and permanently secure the awning with the cover on. Surprisingly it wasn't too difficult to line up the bolts and secure the awning to the rack. The new bolts are amazing and one of the best inventions we've seen lately. Our rack doesn't have a wide bit at the end so we can't use T-bolts. I wish Kaon made fishing rod racks in a similar style to rhino lockable ones - that suit a platform rack.