Ford Motor Co. has increased cash rebates on two of its 2004 F-Series pickup truck models by $500 until the end of August, Automotive News reported Monday. The additional rebate will be applied to the F-150 regular cab pickup with no rear seat and the four-door SuperCrew version. Total cash rebates on the F-150 regular cab and SuperCrew trucks have been raised to $3,500 and $2,500 respectively. This month, General Motors set the basic cash rebate on most of its 2004 model cars and trucks at $3,500 and $4,500 respectively, according to Automotive News.