Re: help...What is it?
Some sort stabilizer notch for some sort of pet or child restraining fence or other device to block forward access to the cab, perhaps? Were the previous owners pet people, or parents/grandparents?
It's not a sprint(er) (unless you make it one), it's (hopefully) a marathon.
RV - 2018 Navion 24V + 2016 Wrangler JKU