sorry about that. lets take some small steps here. what type of plug receptacle do you have on the back of your Suburban to plug your trailer in? the most common types are flat 4's and 7 way. the flat 4 is a flat connector with 4 wires. the 7 way is a round connector with seven terminals inside. the flat 4 is your basic everyday connection it powers right turn, left turn, brakes, running lights and a ground I know that is 5 circuits on 4 wires don't worry about that now. the seven way powers all those plus trailer brakes, a hot wire to provide a charge source to your trailer batteries, back up lights or other accessory and a ground. so go back to the rear of your truck and see what is there. btw most tow packages will have both connectors if it was a factory installed tow package.
for the hitch(ball mount) if you want to get it before the trailer go to an RV place and tell them you need a standard height(16") ball mount for your receiver with a 2" ball. while you are there ask them what class your receiver is. btw the ball mount and ball and pin should be about 30-40 bucks, ask them to show you how to put it on and off. get back to us with this info and we can go from there. I hope that clears it up a little. highdesertranger