Here's what I might do in your case. Check around your area and find a professional welding shop that would do the job for you. You will need to bring it into the shop but if it is a roller then there wouldn't be a need to remove it from the trailer, If it's still the bare chassis or nearly bare then that is even better. I would think that four small people could lift onto a trailer. Again they would be able to weld it up in place.
That is 15 minutes' worth of work for a pro as long as you can get it close to his machine in the shop.
On the other hand here's your chance to buy a Tig machine.
Must haves :
Runs on 220 single phase VAC and 50 amp service
200 amps capability and both ac and dc capable
Get an auto-dark helmet with a replaceable battery in the flash filter.
Go to the local gas supplier and tell them you want a 125cf argon tank you can swap with them when it needs refill. Don't buy one used.
You can make your own welding table as your first project.
Anything else is gravy. You can get a perfectly good machine for a lot less than 1000 bucks. See below. You'll use it for the rest of your life
You will pay for it very quickly by saving time and money and trying to find a shop that will do small projects with a quick turnaround.
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Or if we can get it into my shop I'll do it for you.