"I was more worried about the electronics after sitting for approximately 8 years and perhaps capacitors or some of the other electronics failing from the lack of use."
That would be what I was thinking also. Never had the problem with inverters myself, but other items I have. Had a great old 23 Channel CB I bought new, worked perfect when I put it away well stored. Few years later I hooked it up and nothing. A few other items same thing. Worked perfect when put away, dead when I tried to use it later.
I would ask to see it work if posible, politely mention electronics can die from just setting unused at times. Take the needed batteries with you if you have too. Make sure it fires up right and run a decent load a few minutes, maybe a cheap 1500 watt heat gun or the wifes hair dryer, maybe make some toast
I am geussing it's local enough to you your not having it shipped in?
Before buying a Matrix 5000 from E-bay I made sure I could see it work before paying for it myself, then drove the 800+ miles (one way) to get it. Nice vacation. And shipping on that item would have been $300 anyway.