I have a 14 ft PJ with a single lift cylinder, I did have the "D" ring the cylinder mounts to break loose. I had it rebuilt and PJ covered the cost. I welded the center of the plated in the floor, as they seemed to open a bit, the gates for the ramp doors were really tight. I drilled those with a small drill bit and using a needle attachment on the grease gun lubed them they are perfect now.
I used it for building my shop about 100 loads of Rock, Possibly overloaded on 90% of those loads. I use it for haling my loader and getting wood it is great with sides extenders, and strapping the stacked wood down I can haul 3 cords, and I usually split it in the bush, unloading is just remove the back couple of rows. then close the doors and lift the box that puts the doors at mid thigh level and with 2 people it takes 45 minutes to stack it.
Great unit!