I purchased my Berkshire in March 2012 and they had a $5,000 rebate going on at the time. I would assume it would be the same this time.
If it is --- It's a rebate directly to the purchaser and can't be used as part of a down payment or to reduce the purchase price at the time of the sale. It's a check that comes back directly to the purchaser from Forest River.
When we gave our dealer the code from the Forest River web site they claimed to know nothing about the rebate (our dealer was horrible, but that's another story) About 6 weeks after our purchase we got our check. The dealer, after they found out about the rebate, incorrectly filed the warranty papers and the rebate forms. Once we got that straightened out Forest River sent the check overnight.