There are a bunch of nice Tonneaus out there - check out this Tonneau guide - it recently helped me a ton when I was on the market for one:
http://www.hitchanything.com/Tonneau-Covers/
That's cool stuff! I ran across this really sweet trailer wiring guide - it may help you in the future!
http://www.hitchanything.com/trailer-wiring-diagram-guide.html