It helps, but you can also just replace the king pin with a air ride set up on the trailer. That way you can still remove the hitch from the back of the truck if needed. The air ride hitch is a pain to remove from the truck.
The king pin air bag/shock set up is about $800-$850 installed. Installation is just 4 bolts, under 1 hour. Remove the current king pin/extension and both this new one on.
http://www.trailair.com/products/airpin/
How much more is the air ride hitch with install? I would guess at least $1500 more.