No. Absolutely not. NO.
When I switched from 9.00s to 11.00s someone at the tire shop stuck 9.00 tubes in some of the tires since he remembered those coming out. Week and a half later TWO tubes had split with full air loss while driving around on improved roads. No offroading, no curb jumping, absolutely no load at all.
Shop manager was p'od but did the right thing and pulled all the other 11.00s off the truck and replaced the split tubes plus two others that hadn't split yet.
You might get away with it, but personally I won't ever run without the correct sized tubes. I carry my girls all the time in the truck and new tubes are well worth it.