I am not an expert on all the different brands of 5th wheel air hitches but I can tell you that I bought one four years ago and have been thrilled with it.
The company I bought mine from has since been sold and moved. I tried getting replacement parts the other day and the new company does not even carry spare parts for the previous company's designs.
Regardless, look for someone that uses reputable air bags, such as Firestones, and one that articulates in six directions (up/down, right/left, back/forth).
Whether you make short or long hauls, you will feel the difference and your back will appreciate it.