I changed the tyres at a tyre shop last week for the work van and usually they balance all 6 wheels ( dual rear wheel lorry) but this shop said you only balance the front ones, and he removed the weights from the rear wheels and put them on unbalanced. I find it strange, every other tyre shop seams to balance all of them. I asked him about it and he said he knows better, that you only balance the rear ones in normal vans, that have 4 wheels.

Anyone have any experience with this? I searched the forum but couldn't find any topic already opened.

You need to go back to the other tyre shop.

Never heard that one before and I used to change tyres and balance wheels, four unbalanced wheels on the rear could cause damage to bearings and severe vibration through the body, I`d take it back as there is a reason why the balance weights were there in the first place.....

Can't see any logic in this. It's unlikely to find any plain wheel accurately in balance, and there's no point in fitting an unbalanced wheel if it can be corrected. Especially if wheels are paired - there may be a lucky orientation where the imbalances can cancel each other, but equally they could reinforce.

That fitter must be talking nonsense.

Agreed . Or is just too lazy to go to the trouble of doing the necessary work.