That Witzco is gonna look good when You are done with it.
I have pulled three different Witzco trailers in my day so if You don't mind I would like to give You some tips.
First of all from my experience just because You have those two safety pins in in the bottom of the gooseneck that are supposed to keep the trailer from coming apart while going down the road don't trust them. I have had two of the three come apart on me with the pins in. I was not driving down the road when it happened, but I was making a turn into a driveway that had a hump in it both times and yes they were two different driveways
. While turning the trailer drug over the hump and the front of the trailer raised up and it pulled apart. From my experience as long as you go over a hump straight with these trailers they won't come apart, at least they never did on me. One time I was lucky and caught it as it was coming apart, the other time I didn't. That leads to my second bit of advice. Make sure you either have a new set of air hoses and a spare pigtail with you or all the necessary fittings to splice your air lines back together after you pull them apart and also keep a spare set of plugs for your pigtail and some butt splice connecters with you and all the tools you would need to fix those items. Its not a good thing to be stuck half in the road and half in the driveway waiting on the parts to fix the mishap, and also which is the way it works for me, if I have what I need to fix a screw up with me I usually don't ever need it.
Next on my list is the bolsters. If you plan on setting a machine on them I suggest you reinforce them. They are weak. We use to haul TS 14 scrapers on ours and the back tires sat on the bolsters. You could watch them bend down when the weight of the machine was on them. What we did was cut them off and put an I beam inside them which was welded to the top and the side of the trailer frame and then welded the bolster back to the trailer. Made it much stronger.
The last thing I can think of right now is the plates that you had welded inside the I beams of the trailer. We did the same thing. You have to keep an eye on them. What happens is as the trailer flexes it will break the welds holding the plates in and eventually the plate falls out and bye bye chains and binders. You are better off to lay the plate on the main beam and only weld it on one side that way when the trailer flexes the plate is free to move back and forth. After that get some plastic milk crates and set them on the plate and put your chains in them and also you can hook the hooks of the chains on the side of the crate and you will always know what chain you are grabbing and it makes it a lot easier to keep track of them also. I have the hooks on my chains painted different colors so I know what each one is according to length.
Just thought of something else. For some reason the brake pads love to rust and freeze to the drums on these trailers. I know it happens on other trailers also, but just seems worse on Witzco's for some reason. Make sure when you take off in the morning that the tires are all turning. I always put a rock on top of the tires then pulled up a little then walked back there to see if the rocks were gone or not. If the rock was still there that meant it was time to get the hammer out. Never did this, but I often thought about laying a piece of plywood or something over the wheels to cover the gap between the beam to keep the rain and snow out.
I hope this information is useful to You. It is all based on past experience and headaches.