Sadie,
Looks like everyone has answered your questions, but to reiterate, you don't have to do both front and rear, and while I haven't done the rear I'm sure it will also help with the sway, etc. If your MH is on the Ford F53 chassis, like mine, I used the Saf-T-Plus model #41-180. You'll also need the appropriate mounting kit, based on your exact year and model Ford chassis.
These will make a significant and positive difference in how the MH handles and make the drive more enjoyable.
Good luck and let us know how it turns out.
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