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I would never abuse mine like that. My luck either an Axel would bend or at the very least a seal or two would blow out. WS
They don't make recommendations for weight capacities for nothing, you break it, your walking. Take care of your kit, it takes care of you. Why not put a pneumatic dolly wheel under the front of the trailer.
Sounds like you are getting gross trailer weight and tongue weight confused. They are not the same. Tongue weight The downward force exerted on the hitch ball by the trailer coupler. In most cases, it is about 10 to 15 percent of the GTW. To tow safely, the tongue weight must be sufficiently positive when the trailer is empty and/or when fully loaded. Check the height of the tow vehicle's bumper before and after loading. If the loaded trailer doesn't drop the height of the bumper by at least another inch, then reposition your load with more weight in the front of the trailer. A 300lb shack on a trailer does not equal 300lbs of tongue weight.
Since you have a straight rear axle I wouldn't worry about adjusting shocks. I don't see why you would have much of a problem since I watch my local boat dealer pulling good sized walleye boats around with a riding lawn tractor.
I have IRS and tighten my shocks in the fall in case I pull my wheelhouse with it. Unless I do this before my son sits on thr rear, rack the only thing my headlights are good for is hunting spotted owls.
get a can-an outlander and go