I've never used Timberens or the like but have used and currently use air bags. I have train horns so I have a 12vdc compressor and air tank in the truck bed for that. I installed two 12vdc solenoid air valves in the air bag lines. One to inflate and one to deflate. Ran the power wires for the solenoids to momentary push buttons at the tailgate and under the driver's dash with air guages at both locations.
The reason for the two locations? When hitching/unhitching I can run up the pressure thus raising the hitch. This makes connecting/ removing WDH bars quick and easy standing behind the truck. From the driver's seat I can back under the hitch (confirmed in the camera I installed) and raise the ball into the coupler. Makes hitching up very simple. Then while driving I can adjust air pressure for road conditions.
A footnote: it bears repeating, these. devices DO NOT INCREASE LOAD CAPACITY BUT RATHER DECREASE IT BY THE AMOUNT THAT THEY WEIGH.
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel