Tough call on choice IMO. I would ask you if you want to drive a dually truck as a daily driver or a small car/SUV. Even though you are staying put for months at a time you still need to get around town.
I guess I would be opposite of most if I was traveling less and staying longer in one spot I would opt for a large MH and small car/SUV. I currently have a SRW CC LB truck and while it's great for me to drive, my wife hates driving it. If you go large 5th wheel and DRW truck will your wife be okay driving it? Or are you taking another car for her to drive? I would imagine she would have places to go without you on occasion.
IMO a 5'er gives you more bag for the buck in the same length. But you need a DRW for towing it. A nice 5'er in the $100,000 range and DRW @$50-60,000 puts you at $150-160,000. Hard to find a decent MH for $150-160,000 to FT in.