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They would only really be useful for short trips like under 100kms. I would assume that most people with travel trailers would want to go a lot farther then that every day of travel.
The weight is only really an issue on take-off/acceleration and hills. It's the terrible aerodynamics of hauling an 8' brick that kills gas mileage the most. Or so I would presume.
So aero-mods are probably going to give you your biggest return. Especially for long distances. Slowing down would help a fair bit too.
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