Will it? Probably.
Should you do it all the time? Probably not.
I've seen half ton trucks with over one ton of stuff in the bed. And half ton trucks towing trailers with close to 10,000lbs on them. So yes, they will. But it's not safe practice, and if it must be done, it should be done with extreme caution.
Honestly, it does not take an Abrams tank to tow a boat 20' or less (even up a ramp). Stopping it is the key, and that would be my main area of concern. Trailer brakes are very important when towing with marginally rated vehicles. As a general rule, I don't like my load to outweigh the tow vehicle. But sometimes you gotta do what you gotta do, just do it as safely as you can with what you have.
Jay
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If you're not living on the edge, you're taking up too much space!