Depending on the weight, I would assume that everything over 20' is too much for the CRD. Considering its a normal ski boat like mine.
When I towed mine, it felt like it was the perfect combination, but also probably the biggest thing I woud tow with the CRD.
My dad has a 23' Caravelle interceptor and I definetley would NOT pull it with the CRD. I used to have a 1999 Grand Cherokee Limited with the V8 we would tow the Interceptor with, now that was a nice combination
I like my Caravelle alot, I always refer to it as the Mercedes under the Boats

And the thing I like most is the design, mine is a 2001 and my dads a 97, they look exactly the same, the bodystyle is never going to look old.
edit:
Here is my KJ with the trailer for the 23' boat. Clearly visible that the dimensions are kinda off

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2005 CRD Sport
Mods: Glasspack, OME HD Struts & Springs, 2" Daystar lift,
255/70/16 General Grabber AT2's on MOAB's
ORM&EHM with great success!
TJM T17 Bumper, 50W KC HID's
