Ahh, OK, so in the '90s, Bounders did have a GFI in the bathroom. And from what I understand from my reading postings on RV.net over the years, many of their models looped to the kitchen. Mine does. If my GFI pops, the bathroom, hallway, kitchen, and outside patio outlets go dead. And if my patio outlet gets wet, like from rain, the GFI pops.
This design querk let to some hilarious time wasted scamperings on my part searching for the reason I had no power in the kitchen when all along it was just the bathroom GFI having popped because of rain on the patio outlet (since replaced and sealed).
Newer RVs have both a bathroom and kitchen CGFI installed as the electrical codes call for one in each location now days.
OP can certainly add one to the kitchen, but it's likely going to be redundant. I'd suggest just changing out the old one in the bathroom with a new one (they do age, experts suggest changing them once every 5-7 years).