I tow TTs commercially for years so a crazy amount of miles 12 months a years 47 states. Own an Andersen but have used an E4 as well as other WDHs. The thing is especially if you are towing a larger TT with a softer 1/2 ton truck is to get the hitch adjusted to get the results you need for the safest most stable setup. Too often people get too little weight distribution out of their WDH.
If you just one time take your wet say 6k plus TT & truck to a CAT scale. Adjust it by results then sort of stick to that same setting you will unless you dramatically change the way you load your truck or trailer always get a safe stable tow. Pretty much no matter which WDH you are using. Are their differences, are some better than others, or have more appropriately sized bars.. yes. That said its more about the setup. If you adjust your WDH & loading so that you replace your unloaded steer weight and work towards say 12% tongue weight it will be safe & stable as it can be and assuming you are not over Mfgr specs will normally be two fingers driveable.
People talk about stuff like stacking up weigh guesstimates towards a payload sticker number. Not to say watching your GVWR gross vehicle weight rating, CVWR combined vehicle weight rating, max axle, max receiver etc isn't of value it it. But if you keep your eye on the ball and keep the main thing the main thing so to speak the other numbers have generally fallen in line and you will be pleased with your results.
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