you may well want to raise rear ride height considerably before you go or the underside may catch, normal cars have more clearance
if you have spare wheels then fit an old set of fat, sticky rears & drop the pressures a lot, otherwise you'll struggle for grip on the rollers if you have 190+ (last used ACB10s@ 12psi )
having this right before you go saves time which really is money on the RR
make sure the fan goes low enough to hit your radiator, or take heavy cardboard and a mate to hold it to get max air-flow to rad
we all know how much K-series love rpm & heat ☹️ ☹️
don't forget your ear defenders
if you're sitting in the car for ballast the side skins get very hot so long trousers
hope this is helpful
jerry