It's hard. Where I put in most last season the only option was to use beach wheels. I have to tell you that a 400lb cat is hard to drag up the beach. Especially after being on the water for 8-10 hours. The worst part is getting the boat up onto the trailer, even with the rear rollers. Unless the height of the trailer rollers or cradles is the same as the beach wheel axel, then you do have to work pretty hard at pushing or pulling the boat up that incline.
I have started to use the boat winch to get is on the trailer from the beach wheels. This can still be tricky as the wheels like to shift on you at inopportune times.