Steve
I have a 3665. . just like in the picture (black. . sorry mine is dirty... its been in storage). I used it on my old tow rig,, a chevy v3500 gasser... we got . 7 mpg better with this setup. . Im going to install in on the dodge after I build the bed and put a aluminum shell on it...
I know it didnt hurt my mileage. . and I know it kept the bugs off the front of the trailer... . I mounted mine on the trailing edge of the camper,,, I had to reinforce the shell by tig welding a new crossbrace... other than that it was simple
The quality was excellent, the fiberglas thick and strong... the crossbraces were sturdy, polishes up great, stainless hardware
the customer service ... awful,, I had to write the guy 3 times to get him to call me to order one
the box was destroyed by the shipper (yellow freight,, they suck) but the unit came through ok. . including the hardware bag (remind the guy to tape it to the unit)
IF. . you can get the guy to call you to order one you will not be disappointed... maybe he's just busy making them and its a one horse company,,, I give the unit 4 stars
Attention: TDR Forum Junkies 
