4 ton vans equates to US Utes and small trucks only.
even 3 ton are illegal behind most of todays vehicles.
When you add\subtract the figures in\on both vehicles.
Getting up to those weights.
I reckon ALL should be 5th wheelers.
and all drivers of such have Semi licences.
The roads would be a LOT safer then.
With ALL drivers having a modicum of
serious driving instruction,Training.
Not an old retiree
not having had much more than family car and 6x4 before.