what kind of beds were provided to the three friends by the mother of the young boy during their stay at datchet during their first trip ?

From the text:

There were two beds in the room; one was a 2ft. 6in. truckle bed, and George and I slept in that, and kept in by tying ourselves together with a sheet; and the other was the little boy’s bed, and Harris had that all to himself, and we found him, in the morning, with two feet of bare leg sticking out at the bottom, and George and I used it to hang the towels on while we bathed.