My dad used to his 27' travel trailer with a GMC Safari Van, perhaps that same engine. of course, he had a transmission cooler, weight distribution hitch, 5000lb hitch, etc.
He also took it easy while driving, well you sort of have to.
It's not "unsafe" per se to drive, as long as everything is balanced and all other conditions are met. You would have to be very careful that just the right amount of the trailer's weight is on the van. Too little, and the van's back end can float around, due to trailer lifting it off the ground. To much, and you won't be able to steer.
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