Selling in WI - 'rent back' clause (?)

[Kelly G.]

I  am selling my house in Milwaukee.  I then have to drive back to CO with a dog, 2 cats and a small trailer in tow - likely in January or early February - the Worst time to cross the country.  Any suggestions on how I can word a clause in my counter-offer to allow me up to 2 weeks to rent back the house after closing, in the event weather precludes me from leaving.   Or is it as simple as "if seller cannot provide immediate occupancy at closing, seller will pay buyer $XX/week for up to 2 weeks after closing to provide adequate time to vacate the house"

Thanks!
Kelly Goocher
Milw