Dumpers - Cab or no Cab

[JD450A]

guy that i worked for always insisted that the digger and dumper should be the same size ie 3 ton digger 3 ton dumper 30 ton digger 30 ton dumper
always seemed to work out fine

Digger should always be a dumper and a half bigger...... 1.5t digger, 1t dumper, 2t dumper 3t digger, 6t dumper 9t digger, 9t dumper 14t digger, 25t ADT 40ish ton digger.
That's my view anyways