Gen2 Volt owner here. Oil change every two years and that is based on Factory recommended calendar as we don’t put enough “gas Miles” on it to hit the mileage interval for the oil change. Air filter hardly gets dirty we drive on gas so little.
Haven’t had to do a brake job either thanks to regen braking. Likely never will have to unless an inspection shows something out of wack.
Our Volt has had far less maintenance needs/costs than the car it replaced when that car was the same age.
As a Volt owner, I love the RamCharger… But for what a nicely optioned one would cost I’d likely be better off paying for a 1 ton F-350 diesel for the assured extra towing capacity.
Still… I think towing with Ramcharger could be better than my current F-150 as the Ramcharger would be heavier, and have a lot more HP/Torque. Additionally I could level 1 charge it on site at the campgrounds so would have less gas use while out exploring the areas we camp in, but also likely be at full charge for the drive home. Would definitely increase my towing MPGs a bit.