An RV cam would be nice for a heavy truck. Cam/lifter failure has to be a consideration. Good suggestions for lifter refacing and a regrind.
I used Oregon but mine was a Magnum roller. No issues.
FWIW I watched a YT video about causes of cam and/or lifter fail. It was stated that cam grind angle seems to be the issue. If you decide to replace your cam you should definitely measure for lifter crown and cam lobes should have longitudinal taper to them so that the lifters will spin in their bores.
