Answer to "worst fuel milage with an open flat than rolling tarp why?"Jerzy got it right. Did you buy this truck uesd or did you have it built for you. Most truck are setup for van. So it would get better MPG with a rolltarp setup.
Answer to "Do you have a microwave in your KW T660?"I was looking at Best Buy. They had 1 that was a little smaller than my walmart one is. I'm going to an RV shop next