Most likely manufacturers rate load capacity on the low side, (part of engineering 101 CYA)Frame, hitch & engine are "probably" up to the job, but on uphills your tranny(and it's cooler) may not be, worse when you roll over the crest and start going downhill, the boat might become a pile driver overpowering the stopping capacity of your brakes...(or at least frying them and your rotors). I'd get a different tow vehicle....