Same pic showed up in thee SoCal Craigslists two days ago.
#1 Clue... Look at the price, it's always to low and almost always an odd number like $2507. No real seller would do that. The scammers do it to keep track of ads and to bypass ad matching searches. All three ads for the same trailer in SoCal were different by $1 or $2.
I just hit the "Prohibited" link and flag them.