We have a small Autotrail tracker ek . Above the small pull out canopy is a 300 mm long awning rail. The rail is 275 mm from ground. Want to buy a driveway awning and am being drawn towards a Vango Kela 4 or 5? Says it needs 248 mm of kador to fit so assume my awning rail is sufficient? Tall version of the same does up to 290 mm height. Airbeam technology is new to us. Only want to buy once so thought we would ask you very helpful peeps on here for your thoughts suggestions and experience? Is it up to the job?