Perimeter

The perimeter (also called tent dimension, A dimension, circumferential length) of a caravan is made up of the length of the keder rail and the distance to the ground from the beginning and end of the keder rail. The circumference is important to determine the appropriate size of awning or sun sail.  Measure perimeter: Pull a string through the keder strip attached to the caravan and measure from one side (A) of the ground along the keder strip to the ground (not caravan floor) of the other side (B).