Measure the length of the rubber roof material from where it begins at the front of the RV to where it ends at the back of the RV. If the back of the RV has a ladder then only measure to the ladder. If the width of the RV starts to narrow in the front, then only measure the rooftop portion of constant, uniform width. The length you measure is the canopy size needed.

If you have any questions or concerns with how to measure, side view photos of your RV can be sent to support@shaderv.com and we will be able to better assist you with the measurements.