I remember reading an article about wind resistance and pickup trucks; the conclusion was driving with the tailgate down actually increased drag and used more fuel. The logic is that there is little turbulence behind the cab as air swirls around inside the box and creates a faring effect. The main area of turbulence is behind the tailgate which has less surface area than the cab. Opening the tailgate moves the area of turbulence behind the cab. The tester used reading from the maps sensor to determine engine load at different speeds. Years ago we had a hardtop tent trailer that we pulled with a big v8 Pontiac. The drag was noticeable at highway speeds. One trip we brought a tandem bike with us; I put is across the open trunk with foam and strapped the lid partially closed on top of it. Nearly all the drag from the trailer went away as the partially open trunk lid sent the air over the trailer.
I was wondering if the larger front brake set up you installed would work with 16 inch wheels?
I remember that test being run - although in my case I think it was MythBusters. Either way, same conclusion. I notice wind roiling off of transport trucks causing sideways instability when following in their wake, but tailgating way too close, for hypermiling, takes away the roiling.
As for the brakes, IIRC, DL175 has run these large brakes with 15” steel wheels. We do have weird calipers on these RAVs which means the wheels need a funny offset - a test fit is always necessary in our case. I got away with 17” Mustang wheels on mine even with the large brakes, but I have about 1mm clearance from the inner face of the wheel spokes to the brake caliper bracket.
Back to towing for OP: if you’re looking at that trailer, there’s a couple of points I’d like to strongly suggest:
1. Add the front brake upgrade - you won’t be sorry. Strongly consider the rear springs from the 3-row model too. And definitely consider an external transmission fluid cooler, with a flush.
2. Trailer brakes with electronic controller
3. Temper your expectations when towing, and get familiar with your gearshift - and on the freeway unless the trailer is lower than your roof, forget about using D - you’ll be in 3 most of the time. Like me, you won’t be setting any land speed records, and may not be keeping up with freeway traffic.
4. If something happens and you have a crash while towing, being over the tow rating you may not have adequate (or any) insurance coverage because in legal terms you’ll have overloaded your vehicle. Not likely to come up, if ever, but it’s good to be aware.
Hope you find a workable solution!
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