Hi, find a decent trailer capable of properly supporting 8 feet or so from it's ass, then extend the trailer tongue. Tongue extensions are all over the place "Trailer Parts" in the US. It's not a big deal to extend them, especially light weight centre-forward boats.
BTW: I'd recalculate the weight of SIB and Motor. I'd add 300 lbs without onboard battery(s) and/or fuel load. Good luck.