Allowing my SO to take our unit for the weekend ?

Yikes! If she were experienced with the rig (backing etc) maybe, but consider breakdown, having to get out of tight spot etc. I would stress to her "what if?" Of course then she will say then you should go! Tough spot. Just say No! We all know how that will probably go. My wife wouldn't even ask cuz she knows it is way over her head and she has no real interest in learning.

Agreed... not enough time. And your estimates were best case. It might be 6:00 before they get there.