The location is a big freeway, about four lanes each direction, and a surprisingly steep downhill section.
But location side, the bigger issue is how the biker lived this long?
If this event happened as reported, then yes this biker definitely was none too bright.
I have a hard time believing the MH could catch up to a bike from behind if he was paying attention, so either he broke quickly in front of the MH or he slowed because he lost control for some reason. Either way, being that close to a 30’ RV on a downhill grade ain’t wise either way.