Rear wheels

My hull protectors made of a hose (on a picture below) were not big enough, instead of buying expensive foam protectors or making my own, I thought of adapting a set of Zodiac wheels that I had. Anybody tried something like this?
The connection to the beam doesn't seem very heavy duty, I wouldn't use them to raise or lower the mast, but otherwise they work nicely. The front wheels still have to be centered to take most of the weight, to make turning easier.

Sorry for the picture quality, bad camera..