I will buy the Geico plan when I get the truck , tried the VIN with Geico and could model a quote (much cheaper than buying an extended warranty)
Very happy with my Geico!
I would to this:
have a charged battery available (fed with with a trickle charger)
when you are going in the trip load it in the truck together with the inverter
no wiring needed!
I would not do it
400W means 33 amps discharge from the battery
150w means 12.5 amps, that is not so bad, but still would discharge a 50 amp hours battery in 4 hours or so
And 150w is good for small tv, some led lights for the party night etc
end of my 2 cents :-)