[Silversmith]

Rick Lake has the right idea. While I use a 95 F250 7.3 TD instead of a dually, I expect to get 15 to 18 mpg over long distance trips by using/building a bed mounted sheet metal/alum. frame wind (50#or less est.) deflector attached on top of my adjustable alum. ladder rack system. With the back section of the rack system adjusted to almost the equal hight of my trailer & the front section set to match the roof line of my truck cab. As it stands now I average between 12/14 mpg without the deflector. My truck w/o tow averages 17/18 mpg. The HaulMark basic trailer is a great platform to custom build what you need/want. I like Rick, have the 4 wheel electric brakes & hight adjustable hitch. They are smart options. IMO the HaulMark 20'/24' trailers are a very good choice for hauling Cobra's or any other low slung classic. I have had a GT-40 with 2" clearance, load with only a couple of 3/4" x 6" x 7' pine boards placed @ the ramp end with out any problems. My Cobra with 3.5"/4" clearance loads with out any assistance.