LOL
This has not come up on my RV policy with Foremost, but probably because they haven't asked and I haven't mentioned it. 19 y.o. son and 17 y.o. daughter. When I bought the motorhome 4 years ago, I listed myself as the driver 99.9% of the time, with my wife the other 0.1%. She has yet to sit in the driver's seat.
My son on the other hand, drives it on occasion if absolutely warranted, has routinely parked and maneuvered it with and without the 20' enclosed trailer hitched at home to get stuff ready for a trip, and is absolutely the only other one in the household I'd trust to regularly pilot it. But this is not your average teenage driver, not even close. He does close to 40,000 miles a year on the road to and from school and "commuting" to the racing and driving schools he works at; has been a top finisher in a SCCA Pro Racing series the last three years. Those "commutes"? His "jobs" home for the summer from college are performance driving instruction gigs making $300-$400 a day, at race tracks all over the northeast and southeast.
Unfortunately, even though he teaches teen driving safety courses among stuff he does, it doesn't make a penny of difference on any vehicle insurance bill of mine. I can only imagine what it would do to the motorhome policy if I did formally add him.