I bought one for my Parker 23 DVCC. I can attest that it is a really well made trailer. It is very heavy duty and holds the weight of the boat well. I expect it to last very long time. Dan and Chad were very helpful and delivered the trailer to Virginia.
The trouble is, Rolls Axle is an expensive trailer. Many people want something cheaper up front. In my experience, there is nothing more expensive in the long run than a cheap boat trailer!
Once you see the axle design and the overall construction, it is clear that it is a unique trailer. If you are thinking of selling them, you need to have one or two on the lot so people can see them.