Comparing 5th wheel hitches
The Reese slider is as good as any manual slider, and I believe only costs about $100 more than the non sliding version (in fact you can even switch between slider and non-slider without much difficulty). Keep in mind that to use it, you would need to stop, get out, unlock the slider, pull the truck forward a foot, stop, get out, lock the slider, make your turn, stop, get out, unlock the slider, reverse the truck a foot, stop, get out, lock the slider and then you can drive off. If your hitch pin is the 'extended' type (sticks out in front of the trailer) you may not have to do that very often with a little care
I've seen a slider which is motor controlled from the cab, but it was mucho dinero ($4000-$5000). Pullright make an 'automatic' slider which slides as the trailer turns. Strictly mechanical, it is much cheaper (probably under $2000), BUT, if you ever unhook with the truck significantly not in line with the trailer, it may be difficult to impossible to hook back up... Also, it requires mounting a plate on the hitch pin, an additional step.
I think I've seen a sliding air hitch, but its probably even more money than the already pricy air hitch.
I don't know who makes the air pin, but I know that Camping World sells it. So go to a nearby store, order their catalog or check them out online. I don't have any experiance with the air pin, but they appear much less involved than the hitch so perhaps won't be as effective. Also, I'd have some concerns that its installation might be weaker in the critical pin box/trailer frame interface, which is subject to lots of stress. This is definitely something for an expert to install!!! One you can trust to be there if it goes wrong and the trailer is damaged...
In either case, it is likely that you will at a minimum have to regularly top off the air in either the hitch or pin. I've got the same air bags in my old truck's suspension and they lose significant air over a relatively short period of time.
Personally, I don't know that I'd be worried about damage to the truck from running without either an air hitch or an air pin. Aside from the going over those *@(#$ speed bumps, I haven't noticed any particular stress being put on either the trailer or the truck. The damage I would worry about is twisting torque on the trailer frame from a hitch with does not rock side to side any. I added the side to side lockout on my Reese 16K, so I can go either way (rocking or non-rocking). Perhaps a better investment than an air hitch/pin might be shocks for the trailer.