We weren't discussing power (okay, I got into the weeds with comparisons), but are primarily addressing total weight, and the tow rating of the OP's van. They are rated where they are for a reason, and capabilities of the engines, per the engineers, may be part of that rating.
Plus, while some people are okay with slogging along on inclines, others aren't. Better to be aware that one may not be able to hold a desired speed, than to get a trailer and find out the TV is not capable of maintaining speed on an incline.
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