Suzuki and Mazda are the latest brands to offer scrappage scheme discounts.
Suzuki is offering up to £2,000 on selected models against pre-2010 cars before the end of this month and Mazda is giving up to £5,000 on chosen models before the end of this year.
The haulage and logistics sector could be very badly hit by any proposed new immigration rules, says the Freight Transport Association.
FTA companies depend on EU workers to make up the shortage of up to 30,000 UK-born drivers, particularly at peak times such as Christmas.