Lifespan of mercedes Antos

Rigima:
Hi There, need some help to figure out how many mileage can a mercedes Antos 6x2 299hp euro 6 can comfortable do with good service before its start to need expensive repairers. thanks

Firm I used to work for has 2017 Actros 6x2 rigids
DPF problems (would get stuck in regen ) , and in last 6 months cracked exhaust manifold
Also a tractor unit has killed 2 ECU’s due to an exhaust leak as the ECU is on side of exhaust unit
Ride is rubbish empty and I hope you e got a good chiropractor as the seat make yer back hurt