First thing I would do is check the decal on the lower drivers door frame and find out your specs. What is your pin weight and are you close to you max payload capacity.
I think the Timbren's are a better idea than Airbags (of which I generally am not a advocate of). That said if you want adjustability the AB's are a better route IMO. But if its just to level go with the Tims. But before you do anything know where you stand capacity wise...
US Army Infantry, my rucksack was my RV
'16 Jayco Eagle HT 26.5 RKDS
'15 F 350 CC, LB Dually King Ranch