National General thru Good Sam. Have had NG for several years, no problem changing it from vacation use to FT. Just got renewal notice for next year, no increase. It is not cheap, tho, insuring 2 vehicles and a large fiver in Texas--$4000. Checked with FMCA who advertise 'best' rates for RVs--was going to be $700 more for same coverage....
Shop around, lots of insurers for FT, but they have to be in the RV insurance business as more than a sideline.
Miller Insurance, Farm and City are two companies mentioned often who insure for vacation and/or FT use.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired