They stick an ad up pricing the lorry significantly lower than it should be.. They never answer the number that's on the ad so what exactly do they gain from doing it?!
It's a scam. If you email them they will reply, but for some reason you won't be able to view the lorry (seller too busy, on holiday, middle of a divorce, lorry temporarily located at the other end of the country) and they will tell you if you bank transfer a sum money to them as a deposit they will deliver the lorry to you and that if you don't like it they will give you a refund. Guess how it ends...