What is this thing?

Mrs. LL sends this dispatch from Fort Worth Highway 287 in Wise County:

• 12 axles (approximately)
• "looks like some motorized contraption designed by the pigs from angry birds" (Editor's note: What the heck is this crazy lady talking about?)
• There are two motorcycle cops in front of it and a long line of vehicles behind it unable to get on the freeway because he's blocking the on-ramp. 

Edit: She tracked the thing down later at Harmon Road and 287, and I enhanced the photo in the Liberally Lean Laboratory.