In about 1949 a trailer dealer here in Billings towed a 22 foot M System trailer house (No, NOT a Travel Trailer, a TRAILER HOUSE) from here to Hungry Horse with a 6 cylinder Chevy half ton. No WD hitch or sway control (they hadn't been invented yet). I don't know if he had a brake controller or not. I suppose he did. Anyway, the trip went just fine, except that the little kitchen stove fell over.
So, yes, of course, a half ton can tow a trailer house. Also, remember that back then a half ton was a REAL half ton (6000 lb. GVW), not a derated 3/4 ton!
In 1968 I loaded all our worldly possessions in a 1951 Ford F1, hooked the Corvair Spyder to the back bumper with a homemade towbar made out of a Model A front wishbone, and drove from NW Montana to Seattle. No problems. No brakes on the Corvair, either. Again, they hadn't been invented yet (well, I had never heard of such a system if it did exist.)
Yes, a half ton pickup can be very versatile, IF one pays attention and drives carefully!