I have found most will allow it if you have a fleet policy that has an annual premium of at least $100,000. I have had many excellent drivers with less then 3 years experience I've had to pass on. Every time I ask the ins brokers, they seem to treat a driver with 0-3 years experience as the same amount of exposure. One great kid with a year experience would have added $32,000 annual to my policy for Can/US coverage.
That driver now hauls oversized loads with less then 2 years under his belt and is covered by a policy that pays to play in that market for rookie drivers.