New Limited-flashing check engine light, multiple engine misfires

[vince900ss]

New member here. Recently bought a new 25 limited specifically for towing a small travel trailer. While leaving hotel to pick up the new trailer, started truck cold in morning and had check engine light while idle was fluctuating and running rough. Drove .5 mile, then flashing check engine light came on, and became undriveable. Had towed to nearest dealer, and they found multiple misfire codes (write up says misfire to p0016-00 crankshaft/camshaft timing bank 1 sensor one and b0300 multiple cylinder, DTC card present p0301,2,3,4,5,6 present store codes). Dealer says they were told to erase all codes and test drive for 15 miles. Drove normally, and no codes returned. They also checked spark plug and crank and cam sensor connections, all fine. I cancelled the trailer pickup due to not wanting to risk a roadside problem with truck and trailer combo far from home. Truck drove nearly 100 miles home normally of course. Dealer told me that if recurs with flashing check engine light, could require engine tear down. This seems illogical to me, as it seems like more of a sensor related problem. Any insight from you folks would be appreciated. We're wanting to do some long trips with the new RV, but the idea of being stranded 1000 miles away from home on the side of the road with a trailer attached and vacation plans ruined by a major engine problem is not appealing. How concerned should I be at this point? Is this a very unusual occurrence? Suggestions on next steps...aside from driving it more to see if it recurs. Thank you.
Vince