how can i buy salvage or defected inventory(not cars) from the
insurance company. do they have auction for that or certain website. i
am looking for truckload quantity.to help you understand my question;
when a truck have accident the insurance company pays for the insured
load and then they sell the merchandise thats what i am looking for

If the products aren't damaged in some way then insurance companies
won't sell them.  In order for insurance to pay on a loss, something
has to happen to those products.  You won't be able to buy totally
undamaged goods, but you might get some goods with minor damage. 
Also, insurance companies typically don't sell to the public.  It
takes too much time so they have companies that they automatically
sell to.  I would suggest that you look for a company or listing like
on liquidators.net