You're doing remarkably well with only a 3,000 watt generator for this length of time. Most people are not able to run much off a 3,000 watt or able to run a 3,000 watt that much before they burn out. It's probably because you have a Honda. I had one once and it was great.
I am very pleased with the Honda's performance...still working great after 87 hours...and no sign of work crews yet today so it can take a break.  
It was a painful purchase at the time ($$$), but for this event, it was worth it.  
I think an oil change is coming up soon.   I have to check the manual again.   
OBG, we went with the 5th Wheel/Pickup Combo a few years back for the BOV.    We are thinking about going to the all-in-one variety, but I kind of like having the truck separate.  What is making you consider the 5th Wheel?