Center of Jons is max 3.5T! From the roundabout you first have to enter a one-way street and then a dead-end access road to a private home. Turning around at the service location is difficult, with our 8m motorhome it just went in five movements. Very difficult for longer motorhomes, but they probably won't be allowed into Jons because the center is forbidden for more than 3.5 tons.