I have personly replaced a good many park pawls on these tractors. 99% are broken by jamming in park before being stopped fully. I have even broken one wile testing it . never did that again. however on the power reveser it is somtimes posible for the reverser to stay engaged at the same time as the park pawl is engaged. the p/r cable can become worn and miss adjusted. also deere has had a couple pips (product inprovment program) aka recall on these were they replaced the shifter asembly and a couple different park pawls . I think poping the range shift into neutral mite be very cheep insurance. have had customers break them repetely . I do not think there is an issue with parking on any hill as long as park is properly engaged before dismounting the tractor!!