So you never said did you have or take care of job one ie the WDH? Air bags are good for heavy bed loads & as a supplement to your WDH for a heavy trailer or combination load. But if you skipped the no sway WDH you left most of the safety & control on the table so to speak.
The answer to what can my 1/2 ton tow; Generically whatever TT has a GVWR less than TVís max tow rating. Specifically is found on CAT scale via weight distribution with TV TT & WDH. Best motor & gearing all 5 Mfgs within specs IE safe & stable normally to 8k but passengers & bedload reduce this. RAM 1500 ED max tow 9,200, max axle ratings 3,900, max 09-18 CVWR 15,950, axle weights me & gear 3,240 steer 2,560 drive