Review my Pay plan

Got a job at Hyundai heres my pay structure

$3500 guarantee for the first 3 months (basically for training)

after 3 months it stops and goes to a flat $500 per car sold

Asked some friends and they all said this is pretty brutal and to look somewhere for a percentage for front and back end - cause with $500 per car I can sell 6 cars a month and just make what I make now not doing sales. Is this worth it or run?