What sort of vehicle have you got and where are you planning on launching?
Reason I ask is I have been launching both my alloy pontoon dingy and my 4,5m fryan in estuarys and off firm beaches with 2wd vehicles for at least a couple of years now with no problems, one just has to be sensible about where is suitable and know how to drive.
Not that I have had to do this yet myself but it is entirely practical/possible to disconnect your trailer and push it out into the tide on the jocky wheel (decent one with fat inflatable tire) float the boat off and pull it back up on a rope to the vehicle to keep the vehicle out of the water and or soft stuff.This method is for those really flat sand beaches.
Bigger boats and trailers set up a spare wheel on a hub at the front of the trailer 150mm or so off of the ground to roll em in on but a >4m boat is only going to have less than 50kilo on the towball anyway so no need.
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