Yes, WRECKERS is a Scrabble word!

Letter values in Scrabble US: W 4, R 1, E 1, C 3, K 5, E 1, R 1, S 1.

Is it a valid word?

WRECKERS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

someone who demolishes or dismantles buildings as a job
someone who commits sabotage or deliberately causes wrecks
a truck equipped to hoist and pull wrecked cars (or to remove cars from no-parking zones)

Also: tow truck, tow car.