Maybe I've missed something, but the rear jacks (stabilizer jacks) should not be extended until the trailer is leveled side to side and front to back. If you do as you said and put the rear jacks down before the front ones you can easily over load them with the front jacks as they are much stronger. That may be what boroke the seal.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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