I use B&W products. The turn over ball gooseneck is above and beyond the best. The companion (slider setup is available) is the compatible 5th wheel add on.
I install these, and service a shit ton of trailers of all sizes. I've had a few customers want the air set ups. Next truck, we're back to the OG setup. Bucking bronco is piss poor setup on your part.
If you want to dump the extra money, go for it. As an installer and retailer, I wouldn't push it as a sale. There are more cost effective way to fix the issue.
As far as adding fifth wheel capability, what gooseneck setup do you have now?
BTW, chevy is notorious for having a softer ride empty, and not really living up to heavy duty status while towing. Look into a product called a "timbren SES".
Setting you up the correct way is better done by actual conversation. If you're interested in my input, feel free to pm me a contact number. There are a lot of variables that come into play, and I'm not going to waste time going back and forth on messages when I can just speak to you.
By the way, general consensus is, more weight, more benefit from air. 8K? 3500 bucking? Shit truck, or piss poor trailer and loading setup. Not that I'd condone it, but a 1500 with an in bed hitch should be able to rock 8,000 with no issues.