Obviously don't know your situation but a GF wouldn't stop me from doing the RV thing. WIfe, yes. GF no. If she is in, she is moving closer to wife material.
I will admit that a 26'er would give me pause to live in. I have a 35' Class A and that is barely doable for a year or so.
Me...I sell the 26 but something a little bigger with some of the house proceeds and start on the house and hope the GF is there when its done. If she is, some of house proceeds goes toward a ring after the house is done.
Probably gonna need to see her tits to make a more scientific analysis however.