Buy a Sunshield tarp; the ones with silver on one side a black on the other. Install the tarp with the silver side up and hold it down with either gallon bottles or we use boat fenders half filled with sand.
Size the tarp so part of it hands down over the sides and ends.
IMHO the covers that completely cover the rig are too heavy to install, remove and store.
We fold up our Sunshield like the sailors fold up a sail; accordian-like. We have an approx. 30 x 20 foot tarp and can lift it up and carry it to its storage location.