Hello Rt210,
This range (CX serie) of chassis is starting from 3,5 ton until a 4,5 ton with a center of load center of 500mm. In this range (CX serie) there's a 5ton (A) with a load center of 600mm.
There's also a DX serie range with a chassis starting from a 5ton until 8ton and all are with a load center of 600mm.
Kind regards
marcb