I see nothing wrong with pulling a Suburban if your MH has the power. I have a friend who pulls a newer Chevy 3/4T 4X4 CC diesel so he can load his Razr on top of the truck bed - but he's pulling it with 500HP+ Prevost.
I wouldn't pull a Sub (I used to own a 3/4T) with a gas MH and in a diesel, I'd use 350HP as the minimum (I own one). Besides the weight of the Sub, I'm sure with five kids you're also going to "stuff" stored in it or on top on the rack.
As long as the Sub has a transfer case that will shift into neutral, you should be fine. Don't use a drive line disconnect.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.