I always recommend the Sunshield-like tarps with silver on one side and black on the other. Get one large enough to just cover the roof or two overlapping if the roof is really large. They are much easier to install, remove and store and last much longer than 6 months.
Dick_B
2003 SunnyBrook 27FKS
2011 3/4 T Chevrolet Suburban
Equal-i-zer Hitch
One wife, two electric bikes (both Currie Tech Path+ models)