We also spend about 6 months each year on the road.
Coming from 25 years of weekend cruising boating we had a bit of a head start in what to look for in a RV. The decision to get a 5er was made long before we were ready to look after having rented a class C.
First priority was a good sized workable galley with lots of counter space. For this it had to be either an island or a "J" shaped galley. We have a "j" which has more counter space & under counter storage.
Next priority was freshwater capacity. Our boat has 115gal FW & it is nice not to have to worry about every drop of water used. An 80gal FW or larger was an absolute requirement. This requirement eliminated lots of builders right off the bat.
Next was the fridge. Did not have to be needing to run out to a store every few days if we were miles from anywhere. We did wind up with a large 4 door RV 2 way power fridge.
When on the road eating at restaurants is rare so pantry storage is important. Ours has the washer/dryer cabinet right next to the galley so that was immediately used as a whopping sized pantry.
For your budget you should easily find a lightly used better quality 5er that meets those specs. Mobile Suites, Carriage & Alpenlite all have 100gal FW tanks.
Getting the right one is worth a drive to pick it up. We went at it with a mission that our first RV was going to be our last RV. Here we are, 13 years later, no regrets. Research narrowed us down to 4 models then it was a case of waiting for one of them to pop up online for sale.