Pics of what I want to cut

[Krookz]

Have you ever heard of a 'cut rod'? I'm not talking about air-carbon arc.

There are rods that can be used with just a "plain jane" stick welding power source and stick electrode holder, (and no compressed air), which can pierce, and reach through thick box-like metal sections and cut through areas that might have considerable thickenss (like a "box frame"), where the back side would otherwise be difficult to cut with something that can only cut what's right next to it, like a plasma cutter. Supposedly the cut rods work on aluminum, too. I have no idea if they are long lasting and fast enough to cut an entire trailer, but you might want to look into them more for project:
http://www.harrisproductsgroup.com/e...r/Cut-Rod.aspx

I believe they have a similar effect to the Thermite cutting torches... They're just run by electricity instead.

http://www.youtube.com/watch?v=mShRdpo7PT0