A number of points for reference:
I've just taken ownership of a 2019 V250 AMG and Paid £53 950, this was from a Campervan specialist not private.
It has less than 3000mls and the price included a service, maps updated etc by MB before I took delivery, road tax and the fitting of a MiFi unit and aerial. The service was £599 so well over £1000 worth.
I have a bus tent and paid £500
I've been looking for some time and 3 or 4 have been advertised on this forum, I went to view one of them, all were much lower than than the price your contemplating.
As GT said only you can decide so go for the price you think is right.