[jas67]

Hi All,

I just purchased a small flat-front box trailer, 4w x 6L x4h.
It is about a foot taller than my tow vehicle, a 2015 TDi Golf Sportwagen.

I also tow a 6x12x6 V-nose aluminum box trailer with same TV. I use a wind deflector on top of the TV for this trailer, which is almost 8 feet tall overall.

Highway MPG for the TV alone is 44-48 at 70-80MPH
Highway MPG for the TV + 4x6x4 trailer is 30-31MPG, 70-75 MPH
Highway MPG for the TV + 6x12x6 trailer with wind deflector is 20-22 MPG, 70-80 MPH
Highway MPG for the TV + 6x12x6 trailer w/o deflector is 18-19 MPG, 70-80 MPH


I'd love to do a tail for each of the trailer, and a nose-cone for the small one, but, that will be another thread.

For now, I think low hanging fruit on the smaller trailer might be to lower it. It looks like I can likely lower it 2-3 inches by adding blocks to the axel, which is above the leaf spring, without compromising suspension travel.

Has anyone here done that? How much MPG savings can I expect from lowering it 2-3 inches?

TV height is 58 inches. It is a wagon that tapers a little to the rear.
Current roof height on the trailer is 70 inches.

I tried the wind deflector with the small trailer, it may have helped MPG by 0.5 to 1 (30.5-.31.0). I'm thinking that the wind deflector I have is too severe for the shorter trailer, and that maybe a smaller one, or one with less angle might be helpful. Thoughts on this?

I wish I had access to a wind tunnel!