The listing would specify 'cash payment'.
You won't be able to list anything for sale until you change your feedback setting from private.
You feedback needs to be 'visible to everyone.
Change it on your feedback page.
I know you want to sell your jeep in an auction format, but ebay's rules are going to make it hard for you.
If you do list it for auction DO NOT use a reserve as these are expensive and have to be paid for upfront, and are not repaid if you don't sell the jeep. I think reserves are charged at about 4% of the reserve amount. You'd be better off starting the bidding at the lowest price you'd be happy to accept.
With auctions you cannot exchange contact details until a bidder has won the item and paid for it . This means no one can arrange to see or inspect it until they've paid, which means if they don't like it once they see it you'd have to cancel and refund.
Using a classified ad is much better for you because you make the one payment upfront, you can show your phone number and allow buyers to come and see it, inspect it, drive it etc and they can pay cash or bank transfer -as you've been advised, do not use Paypal. This would be dangerous for you.
You don't remove the ad until you get the payment in your hand, which means if you get timewasters you haven't removed the jeep from sale.
Have a look at other classified ads to get an idea of how to write out your add,
