Dont laugh
but I owned a Kia Sorento (bought new in 2006). It was 4wd/ 6cyl. and was able to pull my 21' Chris Craft Scorpion Walkaround out of the ramp (to and from my house) with no problems at all. I only had to use the 4wd once due to backing in too far. Might look into a vehicle like that for your Tsunami for the very short haul you have. I think the tow capacity was around 4000 lbs or so.
Or, I have a nice 2 owner excursion 7.3 if you are interested
-Fred