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Actually I think a lot of things contribute to the bounce, including the floor. Even the steel frame gives somewhat... all of them do, by the way. Most up-down unwanted movement will be reduced by the center jacks as previously mentioned.
I note that my 30' TT immediately sags in the middle (about 3/4") when I raise my TT with the stability jacks on the ends the least little bit (3/4" for instance). The way to see this is to sight (from a ladder) down the rain gutters which seem to be level on my TT when it's at rest on it's wheels. Look again when the end jacks take some minor weight.
It makes sense that the RV structure was factory built level with the axles already likely naturally bowing the frame up in the center. I looked down my gutters because I was wondering why rain dribbled down the center wall right over my leak-prone slide. Obviously, when the 3/8" deep rain gutter is 3/4" lower in the middle, and the entire roof is also sagged, the rain run-off pours more from the center than the ends.
So in view of this, adding center mounted jacks are a double bonus. If I'm camped more than overnight, I usually add at least one, the low slide-side usually (I purposely park this way, slide off the pad-crown, so that the other-side steps end up lowest to ground). I seldom bother to drive on blocking to level my TT anymore because I don't support it with the bouncy tires anyway.
Wes
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2004 Cougar 294RLS TT
2000 F-250 7.3L 4Dr
2000 Excursion 6.8L
2019 Leprechaun 311FS
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