Ozz,
Two things to consider-
Total weight may exceed your hitch and even the pin/box frame rating, not to mention the truck itself.
The stress is from the side turns on the frame, and not so much straight down the road (per MIMF2). Side turns dragging that little car around to keep up with the backswing on that 3400 puts a lot of side twist on the frame, which is the weakest point. Crossmembers can't take too much of it, even though your hitch may actually strengthen that part.
Our boat is over the 3,250 you mention. Didn't have any problems with our 2955, but that doesn't mean I wouldn't have. Won't consider it for the 3400 because of the extra length.
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