No state requires an actual CDL for personal noncommercial use of RVs, though several do require noncommercial licenses beyond the standard driver's license and frequently the requirements and classes of such licenses parallel the ones for CDLs. (General CDL requirements and applicability are determined at the federal level.)
If the OP is home based in AZ I believe that state does require a class "B" endorsement. This will be due to the weight of the motorhome being over 26,000 lbs not length and frankly even any 40' will be over that. KS requires the same and it is super simple/easy to stay compliant.
Your are absolutely correct about Kansas and we are not the only state that is taking the law very seriously about requiring Class B and Class A non-commercial licenses for recreational vehicles meeting the weight criteria. Many DPs 36' or longer will require the driver to have at least a non-commercial B if the driver is licensed in Kansas without an air brake restriction.
As a side note, when you see a 350/3500 dually pickup pulling a large fiver, they very likely have triggered needing a class A in some states with an "O" restriction (non-semi).
When discussing with a State of Kansas DL examiner recently about RVs and drivers licensed in Kansas, she commented, "I've never heard about a driver of a large fiver or a DP getting ticketed for not having a class A/B non-commercial but, I sure would hate to see what would happen if they were involved in an accident and they had to go to court over a fatality incident".
Just saying, check your state laws for yourself and do not rely on me or anyone else to tell you what you need.
As the saying goes, "Size does matter" in the case of licensing.
Have fun looking for your new motorhome.
Sign me, a DP owner that loves every foot of our 43' but am properly licensed in my State to drive it.
