I've used two hitches with three different trucks, a 94 Ram 2500 gasser, 04.5 2500 CTD and an 07 CTD 3500 DRW, and soon to be my 4th truck, 3500 CTD HO SRW. The RBW hitch with the rail in the bed on the 94 and 04.5 towing a 27' and 34' 5ver. The 3500 DRW towing the 34' 5ver with the B&W hitch.
Apparently your not aware of the B&W system the OP has vrs the new puck system. The B&W base has a post that fits into the turnover ball receptical and is torqued to specs locking it to the frame and the base acts as a stabilizer, (this is where it performs similar to the anderson) that the arms with the urethane pads are connected to. The new puck system is attached to the frame at 4 different points eliminating the need for the turnover ball receptical. This makes the puck system more rigid and will not allow movement of the base. The older design that is very capable and stable has two different bases, one for the flat bed and one for the regular pickup bed. The flat bed version is smaller in size because the flat bed is made of heavy gauge steel or aluminum. The regular bed base is larger, to help distribute to a larger area making it more stable than the flat bed version when attached to a regular bed. I don't have the time to post all the different air rides or other simular contraptions but they are not cheap. When I got the current 34' 5ver I thought about one of these devices because of the RBW hitch was a poor design. Then I bought the B&W flat bed with a companion hitch. No more huck and chuck and it felt very stable behind my C&C. So theres is my history and you can think what you want.
I don't discount your history at all, I have no doubt you know what you are talking about, but most of you guys keep insisting on this B&W, its a great hitch , no doubt. But its just not the end all to all towing issues. IMO you are not listening to anyone else, I am hearing no else knows what they are talking about . Too MANY factors involved to push the fact just on fore ,and aft movement. Thats seems to be the big push here.
I don't buy this movement thing as being the OP's biggest issue., just the fact that most sliders have a little movement, I don't know about B&W sliders ,but they just got some fore, and after movement . As I said mine sure does, and there is no difference in towing between a Reese slider, and a rail mount Andersen ,both four point attachments, plus the adapter on a four point attachment to the frame of the truck. To me that discounts fore, and aft movement as being the biggest culprit with the OP. I am no where near a fan of that aluminum Andersen, don't like the one point attachment what-so-ever, but many have great success with THAT hitch.
I responded on this thread suggesting to him to turn both around adapter ,and the hitch around. Two things ,he was too far behind the axle, and the adapter not allowing that trailair to work properly, he did that , it smoothed up. IMO if he would of left that MoRyde pin box on, hooked up to any decent hitch, doesn't HAVE to be a B&W , but if so great. We wouldn't be having this conversation.
I would like to see the OP take that Trailair off ,and give that MorRyde a shot, I think he would be surprised.
I have a question on these air ride pin boxes, I have never felt like I needed any cushion between the fifth wheel ,and the truck, I asked before, does it take a certain amount of pin weight for the NEED for an air ride pin box, in my thinking it does.
My present fifth wheel is an older Montana fifth wheel with the MoRyde LRE suspension, has a rubber spring between the axles. Was told by a couple sources that short of IS suspension , it was probably the best out there for a conventional leaf spring suspension, I more or less have to agree, my fifth wheel got a bit bouncy , I let those rubber shear springs go too long, they were shot, replaced them ,and it was night ,and day difference. It was gradual thing, but it got to the point where I started to realize I had a problem . I was lucky those shear springs did not come apart. My point here, these fifth wheels, axle placement, suspension etc all play into the OP's towing experience. It can't all fall back on just the fact of THAT HITCH.