There should still be a sticker on the receiver hitch itself that tells you the weight rating.
What is the brand name on the brake controller? That will help us determine the operations of it, but like has been said, a lot of them don't light up until the trailer is connected. This is to let you know if the cord comes unplugged when towing.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter