Rear line lock

I'm not sure how you have it plumbed, but I would imagine you could plumb it to block all four instead of just the front. Although that would mess up locking the front for the water box, if you use it.

You would have to split off the front somehow and tie the rear supply in. I would thing you could get those fittings to do so at a local parts house.

I have been looking at my diagram how I installed mine, and I almost wonder if you would need a second roll control unit to plumb into the back.

Do you have a dual reservoir MC?