Actually an ACCERT engine is ok. They have spacer plate issues but only about 100,000 miles and I've seen some go 250 without any issue, The lower ends are full skirted and very strong. The compound turbo assembly is pretty expensive to replace but I've never seen any with turbocharger issues other than the waste gate actuator which is cheap and easily replaceable.
The big 34 series engines that you would never find in an RV are the ones with the issues and why CAT got out of the on road business. They just loaded up a reliable workhorse with too much emissions hardware and ruined it.
I would not run from an ACCERT at all. You'll never get enough mileage on one to experience issues.