@daniatko,

They only make stand alone GPS units for Truck...

TomTom GO Professional 520 - Europa
TomTom GO 6250 Trucker - Europa
TomTom GO Professional 620 - Europa
TomTom GO Professional 6200 - Europa
TomTom Trucker 6000 - Europa
TomTom PRO 5250 - Europa

But they are not cheap.

You are talking 280 to 500 euros for a Truck GPS unit.

Like TedMartin pointed out Sygic Truck or Sygic Navigation.

They both let you switch from Truck to RV to Car and Bus.

They use Here maps which are by far the best for truck..