Double check the ratings of the jack stands if you're going to raise your MH. They're probably rated by the pair, not single jacks.
Taken from the
Jackpoint Jackstands site:
Load Rating – Jackpoint Jackstands are rated at 4000 pounds. The industry standard for jack stand load rating is to rate jack stands in pairs. Jackpoint Jackstands are rated to satisfy ANSI standards. According to ANSI standards, a single jack stand from a pair must support one and one half times the total rated load for the pair. That means a single jack stand for a pair rated at 4000 pounds must support 6000 pounds. Jackpoint Jackstands have been physically tested to meet or exceed the ANSI standard.