Ouch! It hurt just to watch that video, man that sucks.
I agree with Zipper, it looks like a fuel drum in the back of the truck, probably an area racer, it also looks to have trailor mirrors too, I would be looking awefully hard at some white dodge trucks at the track this weekend.
Another thought to consider is that if he stole it from that lot or industrial area, he might just work nearby, not like everybody knew the trailor was there.
I'd be looking around during the day or night at some of the employee parking lots for a white dodge truck with trailor mirrors.
Goodluck, I hope you recover your tralior.