The single axle should be sufficient, depending on what extras you carry. We would usually fill the fuel tank when we were close to our destination and put extra heavy coolers and such in the truck for the trip. As far as brakes, its any trailer over 3000 lbs and technically with a boat, trailer, motor combo of 3000 lbs, you need a tow vehicle of at least 4500 lbs. (40% of 7500 lbs= 3000) to tow without trailer brakes.
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