yeah my take away from that photo is if the Ranger can tow that raft and trailer it's capabilities are truly unbounded, what a confidence inspiring photo. Oh maybe that cooler tips the scales at 5k lbs so it's as good a representation as any of the 7.5k lbs rating.
I will let you know when I find the upper limit, I haul a lot of short steel and so far in the last few months I have had 1000 Lbs In The Bed and 5100 on the trailer and I must say that is not even close to the limits!