I would think the risk of roll.would he reduced if running rwd. He wont throw it into a turn the same as if ue were runnng awd.
I'd argue the opposite - you are more likely to get sideways in RWD than AWD - and when you do, you don't have the AWD to pull you straight again. Having watched a brand new (as in they had not even made the first payment on it) Ford Ranger 4X4 running in RWD roll over after the driver got a bit sideways, panicked and lifted off the gas causing the truck to rotate even more - on a perfectly flat and un-rutted section of the course - I'm a bit leery of high center of gravity vehicles running an a RWD mode without a very experienced driver behind the wheel.
But as I said - contact Chris and talk to him. We are more likely to let the OP try it at NED on the snow and ice than we are later in the year on gravel.
Tim