hi I'm trying to get one of my awnings to fit my Autotrail t615, I've an Oxygen XL ( blow up) bit heavy by myself , and will sit too high up , I've a small outdoor revolution porchlite square 220 cm X 200 cm ideal ! so the 220 cm is the rail width of awning , I can fit a 230 cm c section rail so me thinks great but get it out of bag and the 220 is actually around. 260 cm with the overhang piping bits each side mm !! Ideas ? What is minimum rail length req to take a 220 cm + the overhang bits Does that make sense ? I've just read it and I think you have to be looking at it to know what I'm rabbiting on about oh well if someone understands it may stop me scratching my head getting splinters .