Lower top height, close up the gap between tow and trailer, tapered end. That ought to make for a slick, effortless tow.
Riding behind the typical travel trailer is usually a big, rumbly wake of turbulent air. Snuggling up behind it usually allows me to cut my throttle back by about a third or more, and you can see the tow vehicle speed up due to reduced load.
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Lead or follow. Either is fine.
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