I bet if you found him other sources of scrap...... not just trailers, he would not fire you. Think about big farms, old farms, or just places out in the country in general. Also look in weekly auto/trucking publications, some of which you may have to purchase for around $1.50. You could also see if he would be interested in old modular trailers, campers, etc. As log as you are bringing him work/money, there's no way he'd fire you. Also, with the economy the way it is, everyone thinks what they have is worth a bajillion dollars. You do have take that into consideration and become as savvy as needed.