Well, I am glad I asked now! I usually don't even use the trailer (my cat is a true "beach cat" and stays on the beach for the most part)
I have noticed that people don't usually put their cat trailers in the water (if they do, its only part of the way). I do have beach wheels but how do you not screw up the hulls sliding the boat off the trailer onto the wheels? I have four cradles on my trailer and I have heard you shouldn't use rollers. I guess it shouldn't be too bad. Ok... but how do you get the boat back on to the trailer? I mean, the thing isn't necessarily light
As far as what mary said- I agree... trailers are made to go in the water.