Belgium- need a box
Germany- can pay at stations for the route (if it was under a 7.5t- even a 7.4t you’d not need this)
Austria- need a box
Due to the age of truck, is it euro 0 or 1? It’s not going to be cheap for the toll.
Ref Sunday, Belgium & Germany ok for 7.5t, but I’d avoid in Germany if you can, it should be ok, but I’m sure will be a reg you are wrong on & you will stick out on the road. Austria should be ok, but it’s tricky & with yr old truck I’d avoid Sundays as are euro regs in certain areas.
google.co.uk/url?sa=t&sourc … qQykPNHdZg
Can’t help ref the other countries.