"If "your rig handles badly in 16 mph there's something seriously wrong somewhere but I doubt you will have any issues, if you do... Start by checking the inflation of all of your tires relative to the load they are actually carrying - not per the door sticker or the max psi on the sidewalls.
When it gets 25 - 35 I have to start paying a little more attention and when I start getting 50 mph gusts it is time to call it a day. My 24' Class C is about as boxy as they come and I usually am towing an 8' tall 6 X 10' cargo trailer as well.
Three weeks ago while on our way to Yellowstone we encountered 35 gusting to 45 out of the southwest between Casper and Shoshoni Wyoming {we were headed northwest} putting the wind right on the beam of our rig. After and hour of this I pulled off at a rest stop and it was all I could do to get my door open into the wind. Took a break for 15 minutes and then got back out on the road and while it was not fun it was doable. After another hour we made it to Shoshoni and put the wind behind us, end of problem.
:C