That looks like a good bit of kit.
My only concern with those smaller set ups is how you’d go living in them for 3-4 months at a time.
I use to live out of a Nissan Patrol and offroad box trailer (if needed), so the Vista RV is luxury for me. I prefer trips of 6 to 8 weeks. My longest trip was 108 days, being the Kimberley/Pilbara trip.
I have a bed, easy setup, shower ensuite with hot water, Joocla GottGo toilet, internal table and work space, plenty of power (400Ah Lithium), 645 watts of solar panels, Redarc TVMS and Project Manager 30 (240 volt charging, DC to DC and solar), full offroad suspension with airbags, 12v air fryer, gas cooking with single induction cooktop backup, toaster, kettle (two, one gas one 240 volt), 3000 watt Redarc inverter, large fridge/freezer, diesel heater, 2 water tanks and 4 jerry can holders, fans and good air flow, lots of power outlets and lights. All electrcis, except the air suspension, are controlled by the Redarc TVMS with the addtional Redarc Rogue. Just use the Redvision screen or Redarc app.
Plus all the setup in the Grenadier like the bed, dual batteries, storage, fridge and Travel Buddy oven. Van tyres matched to the IG.
The Vista RV sits nicely behind the Grenadier, so minimal wind resistance penalty and it weighs less than 2 tonnes. I am told by another Vista RV owner with a Grenadier he was getting 16l per 100KM, towing around 100KPH.
The SLI model setup (internal upright fridge). Roof up, en suite and kitchen out. The XLE model does not have a that small pantry on the right, that is where the chest fridge drawer is.
View: https://youtu.be/YKvBXdExnBs
XLI tour, where
I means internal fridge, (aka upright fridge). Mine is the XLE, where
E means external fridge (aka slide out chest fridge).
View: https://youtu.be/5Qpt1MRbOWY
Retired friends of ours go touring and put their rig into storage whichever state they're in and fly back to Tassie until the next urge to travel strikes. 
