I look at my front diff & think ,man that sits low.It takes the brunt of any large rocks.Is a rock slider necessary? has anyone cracked a diff? Ive got one of those lower,hald guards to help with the cover but not the case.
Just get a sturdy aftermarket diff cover and you will be fine. You would have to hit a boulder straight on at 30mph to damage the center pumpkin. I have G2 aluminum diff covers and they work fine [no hardcore rock crawling].