My advice, a lot of RV's/campers were sold last year that will be coming back on the market as the cruises and amusement parks reopen. I'm seeing 2021 units sitting in yards around my place with for sale signs on them. Watch the used market for a unit that will work for you.
As for the truck, in the length and price range you are looking you certainly shouldn't need a dually. Unless you happen to stumble on a really good used deal on a high end unit.
Auto leveling is great until it doesn't work. Our 2009 doesn't have it and I can be set up faster than our camping buddies with a TT with auto level. I use the Andersen Levelers to level side to side. Back into the site, place the levelers behind the wheels of the low side and back up until level. Drop the landing gear and unhitch. Push landing gear button until level front to back. Push another button until the rear stabilizers are down and tight.