I cut my professional flying career flying river runners out of the Grand Canyon in Cessna 207's where the weigh-ins were done at the initial launch and not after a week of eating like kings and collecting pretty river rocks in the bottom of their duffle bags. Sometimes those return flights felt like they were balanced atop a bowling ball.
Like a lot of folks, I listed my Rv10 max at 2800 and would not hesitate to do it again. It is imperative to fly within the envelope and I would never suggest otherwise, but a couple of times I've been on the ragged edge of weight and/or density altitude and the RV10 performance definitely degrades from spectacular to merely impressive. That wing is a jewel. It is the most capable 4 seater I've ever flown, but you still have to fly safe and smart.
RV-10 BPE, Dynon, Airflow systems A/C
First flight May 10, 2014