The floor probably needs to be screwed to the frame in those areas. Go underneath have some one walk around the squeaking area so you can ID it then using short screws go up from the cross member into the floor. this should tighten it down and stop the squeaking
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12