AS mine is a smart inverter all above no use,but keeping an eye on fridge with a small temp clock all is well,we bit up on very warm days and inverter works harder,2 -3c always mind you.:)
I did a better job on my van,used standard seats and swivels i altered from a car so will lock forward and back,those staples look like they came of frankenstines neck.
I just earthed mine to the black battery wire which is run to the van body,it should run through the carbon in the tyres to ground,mind you no shock if you dont touch ground,only my fridge uses a smart inverter,and im sure the unit is isolated.
Yes small t stat in fridge which is in the blue band about 2c 24/7,mine is never turned of and will run no bother all week on two 90ah batts and 200w solar,winter if i use van it may have to be plugged in at home before we go out.
Mine is a teco but not reading correct speed as i changed the diff,i do use a satnav but would love to correct the speedo,no one at iveco seems to know how to set up the electronic beast.