here's an informative thread about the "give" in the floors and the fix needed.
it seems that many of the mini-lite models have floor sections nearly 4' apart w/out any support for the luan sandwich floor.
thus, over time, it will begin to sag without additional structural repair.
i have a 2008-Rockwood 1809 and i've had to do some support modification on the underside main traffic areas.
that said, i've used my trailer nearly 20 nites per month over the past 18 months as i work out of it. i'm a 240#.
so in my situation, this is purely a function of over-use.
Soft floor between floor beams in 2701SS?? :( Anybody Reinforce??