You can see why operators go for new vehicles and fixed R&M packages now, that bill IMHO is taking the proverbial, and as for pads needing changing they look fine for another couple of year to me, but this also highlights the need for properly specified retarders and employing drivers who don’t drive on the bloody brakes, though best of luck finding them.
As for the dealers being helpful, if our local dealer experience is anything to go by they are by far the most unhelpful by a country mile, i’ll be surprised if we have another from that brand for this reason alone.
In the OP’s shoes i’d be looking for a good commercial garage who trades on good service and values their reputation, whether they specialise in one specific make or not.