Two schools of thought on this…
A) You need to take the gear you need to take to get the job done. If that means packing all your crap all day long then you do so. It sucks but the final image is worth the crap you go through to get it. You say prayers you aren’t Ansel lugging some wooden 8x10 and tripod through the back country.
B) Travel light and be nimble and enjoy yourself. You make the most out of whatever minimal gear you pack knowing full well whatever you leave at home will be the thing you most want when you find the shot.
I just lugged lights and stands and crap to a location where two aerial silk artists were practicing. Got there. Set up lights. Shot this angle. Shot that angle. It all looked like crap. Ditched the lights and went for motion blurred silhouettes.
Should have just taken one camera over my shoulder. Had I done that I’d been complaining I didn’t have lights.
If this day trip is about the photographs then you take your gear. If it’s more about the time spent in the woods and you get a shot or two then travel light. If you’re getting paid take what you need then some. Doing it for pleasure then let it be more about pleasure than work.
Changing lenses without dust? Turn off the camera. Get the new lens ready, make the change quickly. Try not to do it in dusty conditions. Keep a blower or Arctic Butterfly handy if it get’s dusty. Don’t fret too much if it does. It’s going to no matter what. :)