My 2010 23 FB Flying Cloud manual recommends jacking at the designated spot, marked by a decal pointing to a plate where the jack should lift, right in front of the rear stabilizing pad.
This works fine when the trailer is not attached to the TV but not worth a hoot when attached; it just puts the weight on the TV and it hunkers down making my jack unable to lift the axles clear.
What is wrong with jacking on the frame between the tires?
Matt & Virginia Kline
On Nueces Bay, near Portland TX
2016 F-350 6.7 Diesel (Overkill and loving it)