I have had good luck dehydrating spaghetti sauce.  I use a spray cooking oil to coat the plastic fruit roll-up trays and then dehydrate until it becomes "leather".  Roll it up and vacuum bag it.  Works great and reconstitutes exactly as it came out of the jar.  We mix it with dehydrated hamburger, serve with macaroni, and top with freshly grated parmesan cheese.  Big hit with campers.