I have a 2014 295RST on my F-150HD. (Before everyone starts to flip out about a F-150 pulling a 5'r, yes it has been scaled, yes it is within ratings...). My rig was stickered from the factory at 8601, which is very close to posted dry weights. Of course the dry weights mean little.
On the scales when normally loaded it weighed in right around 9600lb. The payload on my truck is 2177 which is likely lower than your F250. In my case I run 100% stock gear, with a 16K Reese manual slider. It does squat and ends up just about dead bang level once I drop the rig on it. I will be getting supersprings in the new year just to help even out the bounce a little.
Personally I think you'll be more than fine without airbags or any helpers, but if you wanted to add them, they won't hurt.
Good luck with your Prime Time product, I hope you enjoy it as much as we enjoy ours.
2015 F-350 SRW 6.7 PSD
2014 Crusader 295RST
1 Fantastic DW
1 Amazing DD
1 Beagle that will be missed (RIP Zeus)