2005 Chevy Silverado 1500, 4.8 liter V8

I've pulled upwards of 5000-6000 with a ball on a bumper. Not a big deal, then again, it was a 2500, not a 1500. I've pulled 1500 lbs with a ball/bumper on a 76 toyota pickup. Not a big deal. As is noted in many of the posts here, and the silveradosierra.com link, the ball is many times too high, so you are hitch high, which makes for poor towing conditions. I can see this issue in your case.

You do not mention if you truck is a rwd or 4wd, or I am blind, not seeing it etc. A rwd is easier to bumper pull than a 4x. If you lifted like my 14 1500 2-3" makes it harder, or if like my sons 06 with a 4.8 V8, 4" lift and 2-3" larger diam tires, His bumper is way up there, along with the 3.42 gears are more like 3.08 or taller gears. He's pulling easier now that he has put 4.10's in the pumpkins.

Another option if feasable, is rent a U-Haul 1500 reg cab truck. Drive the trailer to where it goes, bring the truck back and get your truck. Bigger, better motor, 10 gears vs 4, rated to 10K lbs. If it has a hitch and controller, you're on the way. 

Who's to say it may take two trips anyhow! One for the trailer with a few items, and one with just the truck, as you may end up way overloaded no matter how ones slice's the cake.

But, if you have some friends willing to help you get a controller, hitch etc, you will be way better off this way. As far as breaking things......We in the towing field have no idea what the ratings truly mean per say. You bumper may say a 6000/600 lb trailer, hitch weight. That is the working load it is rated for. Breaking load may be 2-3 times this amount! I can point out other types of items with both of these ratings being shown! You then know the true where it will break, and where it will not break for many years etc. Like the Challenger space shuttle many years ago. It blew up due to a 2 bit rubber O-Ring, that engineers knew it would fail in temps under x degrees. It was -5 below that day. It should never have taken off, but due to a teacher on board etc etc, they took off. We know what happened 30-40 seconds into the flight. Thy push things to 100%. Most of us in the towing world do not push but to 30-40% of breaking. 

I'm not going to say you will be fine! nor will I say you will crash and burn with what you have. Loaded correctly etc, you'll be fine, loaded incorrectly, even with a Hensley hitch, you may very well crash and burn! Due to improper loading, conditions etc. 

I am sorry about your issues, I like many others, hope you will succeed without having too many other issues.

Marty