Had air bags or "bladders" installed on my 2001 {5.4} in the rear, helped immensely with ride height & vehicle stability of the hitch in & out of gas stations + overall handling. I believe 8 pounds of pressure yields the max for handling & ride.
Visited U-Haul & had the brake controller installed. When checking out the brake controls, take a look at how the control functions are set up to "brake your trailer". Use a 15 ' single car hauler {with two axles} from time to time to transport a few original covered wagons & an occasional vehicle. Check out the brake controller designs being you'll be using it without looking at it. I'm right handed, so if your a lefty, let them know what side to install it on for safety. Watch how they mount it not to interfere with your vehicle computer hookup to check out codes. Some mechanics don't think & locate it directly in front.
Mine has a lever {its in the front vs the side mount {over a knob controller} so I know to the right I'm increasing braking power on the electric trailer brakes & to the left, I'm decreasing. In an instant [without going to the far right] on a wet road will cause the trailer to hop, {did that just once to know better - trailer empty in a parking lot}. I found by sense of touch where to position the lever without a visual like most operate it. Down grades or heading toward a light... when a 4 cylinder pulls right out in front of you & decides to stop, with -0- consideration that you're hauling, helps to control the rig to stop within seconds.
Now on my Suburban, I found it best to disconnect the controller power at the fuse box when not in use. Mainly being the guy at the U-Haul didn't connect it right in the first place in route from Michigan to Montana. When I got back to MI on that trip, stopped by U-Haul & they gave me the next higher upgrade for free, being the one he installed was blowing out fuses. Keep a copy of the Brake Controller & place of purchase always with the vehicle, rather than file it, for the road.
On my Ford, if the trailer is connected & I turn off the vehicle, the brake controller light goes out. A good connection. On the Suburban even with the new controller, all is off & its still on, meaning a battery draw over night... so I disable the connection at the hitch plug on overnight stays. Keeping up the trailer brakes to a good mechanical condition are equally important as the wiring, especially after sitting through the winter. Had a newer brake seize up on me in South Dakota once as was able to drive a 100 miles without the rear right hand wheel attached to a major town on a Sunday for that repair. Kept it at 50 mph on the e-way. Locked up right in front of Wall Drugs of all places, better than the freeway. Spun a bearing & just had them checked prior to departure. It got hot fast with little warning & locked up. Was a bear to get off & repair. Stopped at a Semi Repair shop & they had the right equipment for little cost.