AIRLIFT AIR BAGS?////////UPDATE////////////////////////////

will be towing our 28 ft TT weighting about 4900lbs with a tongue weight of about 380lbs.

Your tongue weight is WAY too low. Dangerously low, in fact. You want about 13 percent of the total trailer's weight on the tongue. Plus the weight of the hitch. If your hitch weighs around 75 pounds and you are at 13 percent on the tongue your total weight will be around 810 pounds. Anything less than 10 percent on the tongue is inviting sway issues. Hopefully you are using a weight distribution hitch and also a sway feature. Then, add air to the bags to get a level (pre tongue weight) height.

You add air to restore the height to about what it was unloaded. Don’t expect an improvement in ride, it is just an additional spring.

There is no right answer, every application is different. You should keep a minimum of 5psi at all times then air up when towing to what feels best. I used 15-20psi on my Tundra with 1k tongue weight.

On a side note, have you actually weighed your tongue? 380lbs is nowhere near enough tongue weight for a 4900lbs trailer. If you're adding airbags because of stability issues I would start by getting the proper tongue weights first. A stable trailer will have 12-15 percent of its weight on the tongue. You should have 600lbs on the tongue at minimum if your trailer weight is accurate.