The in the spring bags are generally far less capacity than the other double convolute bags.
If you need just a little help, the inside the spring bags are a decent option but not near as robust.
Doubt the external airbags cost much more if any, installed. Outside bags are bolt on, super easy to install. Inside bags require dropping the axle and removing the coils to install.
You can get a set of Firestone bags shipped to your door for $350 and itโs a 2 beer install. Itโs the way to go imo
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5โ turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold