This is who I use for Progressive. I dropped my coverage to $1m this year and Progressive wrote it for around $4000.00. I had been with Safeco the prior year when bus was new for $1.3m and it went from about $11000 the first year (dec 2021 to dec 2022) and for 2023 they wanted close to $15000. if I remember right. I figured the bus lost some value after a year and I was willing to eat the difference if I had a total loss.
On my Prevost's (3), I had used National Interstate with very decent pricing, but they exited the market a few years ago and all that was left was basically Safeco for over a million coverage. I paid it for the last Prevost, and the first year of the King Aire, but this year I made the change to Progressive. I had used Progressive with the Renegade because it was less than a million to start with.
Melissa at Thum is very good and will get you what you need either way you go..over a million or under.