Here's some pointers from a few years OTR truck driving.
1. Practice, practice, practice.....a big empty parking lot and five orange cones are your friends. There's not that big of a difference between the handling of a short bed or long bed TV, as far as backing the trailer. Your king pin point isn't going to be that different. It's more mental at this point and that's why I said practice. I think you'll be surprised once (if) you go that route as to how little the difference is going to be.
2. Never fixate on just one point (pivot point or king pin). You have 2 points that are pivoting. The first is your king pin in your bed, the second is your axles on the trailer. Neither of which is going to hit anything. The back end of your trailer is going to crunch before either of those comes into play. The back end is a good 10' beyond your rear axle. This is the point you need to pay attention to.......remember, you're pushing the back end where you want it to go.......everything has to follow.
3. Slow going is the key........it's not a speed contest. Once you get the back end going in the direction you want it to go, it will continuing in that direction until the force (turning movement) is counter acted. You have to get back under (TV lined backup) your trailer. In your practice sessions, observe how much movement you get with the back end with a full turn of the steering wheel, then a 1/2 turn, then a 1/4 turn.....get to know and understand the response of your trailer end with each increment of steering. Keep in mind that nothing goes anyplace that the back end doesn't.
4. Know your surroundings and the objects you wish to avoid. If your trailer is 8' wide (usual) and the slot you're trying to back into is 12' or 10' wide then you know how much distance you need on both sides to successfully slip it in. If you've got 2' clearance on the driver side, then you know you've got 2' clearance on the passenger side of your trailer without looking (assuming your space is 12' wide). Your point of reference is going to be the danger side (direction side you are backing in from)........which brings us to the last point.
5. Try to avoid "blind side" backing (i.e. from the passenger side). Especially if your passenger mirror has that warning on it..."Objects are ......". You want as little distortion as possible, driver side backing is always best whenever possible even if it means an extra maneuver is required to set yourself up. With that said, you should practice backing in from both sides ..... sometimes it's not possible to get the driver side position.
6. And one last point............get out and look GOAL! It's no shame. I drove for a company that required you to get out and look at your entry point (that point where the trailer entered the slot) and once again when you were under the trailer lined up to get completely in the slot. In the event you had an incident, the first question they asked was did you GOAL........usually followed by if you did, then how did you hit that bollard or side of the building or that other trailer....and trust me, the last thing you wanted to do at midnight in some god forsaken truck stop was hit the trailer next to your slot and wake up some sleeping driver......that's how the fight begins.
Steve and Lisa
Un-tethered buoys in the shipping lanes of life.
Jayco Jay Series 1206
Dodge Ram 1500, Hemi