Not just on muddy ground - the downhill oleo compresses more than the uphill one. The frustrating thing is even though you can define a nice slope limit as per shytorque says, you add lat CG loading plus a crosswind and then the AI reading the pilot reads is not giving him any useful hint about whether he's about to get himself in trouble. And a limit which factored in slope, lat CG and crosswind would be ridiculous. Not looking for a solution just venting....