Don't forget all that glass in the cab of your MH. TONS of heat comes thru those windows as does the cold.
For the outside I use one like this when parked for extended periods. For short stays I just put one of those van windshield sunshades on the inside of the windshield.
These covers Can be found at almost all of the camping store in Florida. Just be SURE to buy the one that fits YOUR MH style of side mirrors. They are sold by type of side mirrors.
This one is for sale on Ebay
http://www.ebay.com/bhp/rv-windshield-cover