@Mike in Cape Cod
As you are aware I was very much involved with this boat and trailer. A friend of mine well known for sailboat trailer design was consulted on the design of the trailer with me present. Now experience comes into play as I sold nearly 20-25% of the production line.
I picked up all my boats and towed each 675 miles one way to my dealership and after to shows or delivery sometimes adding over another 500 miles. Never once did I have a blowout although when introducing the boat originally I towed it all over the east coast which of course was well over 10,000 miles on that trailer.
The key was to check air pressure, grease, tightness of lug nuts, tightness of bolts, check heat of hubs/rims particularly with brakes, bolts and nuts, etc... the only major concern in the beginning was no offer of brakes which I yelled and screamed for. Ones without brakes you could add brakes to those axles. Often I would tell customers to make sure there was 10% of total weight of load on the hitch. If not you could move the axle and/or the winch stand to achieve 10%. Proper maintenance is the key.
The 23.5 has been out of production for 22 1/2 years. Without proper maintence, anything can happen and that included me a few times. Things included lack of grease, low or overinflated tires, loose lug nuts, bad bearings and racers, Dry rot, tire separation, worn out tires, over loaded due to water ballast still on board/added weight twice for moving house furniture and so on. I saw new tires sometimes smaller which were nit rated for the load.
The 23.5 sometimes was confused with the 23 wing keel as the 23 wing keel set higher on the trailer givinrn s higher center of gravity. Adding a second axle was the preference of the owner but more notably on the 23wing keel trailer. The key to any trailer is maintence!