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does your trailer have brakes? if not, you'll be trying to stop twice the weight your brakes are designed for. you might want to ask your boat dealer what they think, but they may not have had experience with people towing with the H3 yet. test it out on some flat roads before you back down the boat ramp, that will give you a feel for it. but if you've got toungue compression brakes on the trailer, i'm not sure that going backwards will activate them. if nothing else, you can ford somewhere around 30" of water, so it shouldn't be too bad.
the surge brakes won't help much going backwards down a boatramp though, that's where your fording depth may come in handy. it's certainly worth a try to see if the dealer will let you try instead of just telling you it will work.