If you're not bothered by the costs, I believe leveling jacks are a good idea. We just traded a 31' class-C Coachman for a new 31SS and got one with the jacks. Most the time with what little rocking won't be an issue, but a rock solid floor is nice as I had them on our first RV (TT). They also make things easier than driving on and off and onto leveling blocks as mentioned above. On the flip side, coaches that size tend to be fairly stable without the jack. I'm picking mine up 2 states and at least two days away and I'm looking forward to testing out the new rig... I'm sure you'll be thrilled with your Melbourne.
A nation that forgets its Veterans...
...Shall too be Forgotten!!!