I often go to the dunes in So Cal. Loosing the Onan due to a mechanical failure would ruin the week. I always carry a backup. In my case it is a 2K Kipor inverter generator. I did take my Champion 3500/4000 once. The down side was it is heavier, takes more space in the toyhauler garage and it is louder. The little Kipor gets used every time not because of a main gen failure but because it is better on gas than the Onan and I seldom need all the power the Onan will provide.
Unless you have a place to haul it, the offered Champion is not a viable backup. So unless you have another use for it, I'd take the Yeti.
I have a big Yeti and they are amazing coolers. They'll keep ice for a week or more. They are heavy though.
