My two sled dog mutts train in bitesports and eat prey model raw. And let me tell you, this breed type... their bodies do not like processed crap at all. They seem to be much more sensitive to it than other breed types.... my hunch is that is because most mushers/breeders continued to feed raw through kibble development and popularity. They were bred to have whole salmon and other frozen animal parts tossed to them.... not eat overpriced doggie McDonalds.
There is actually an excerpt from Lonsdale's book that cites a study done in sled dogs where the high carb/fiber content in premium kibble actually caused the dogs to bleed from the anus during races. I found that interesting. He then goes on to say that a dog who isn't a performance dog wouldn't be exhibiting those same signs laying ont he couch all day, but that doesn't mean its not still bad...
I tried a box of THK Force. My dog in my avatar was having constipation issues on Acana Grasslands. It fixed the poo issue, but she lost so much muscle, gained fat, and her coat frankly looked like shit. It was greasy and disgusting. I finally stopped and said to myself, wtf am I doing? She would not graze on alfalfa in the pasture, she would catch mice! So I changed to prey model raw. The detox she went through was disgusting and a fantastic illustration of just what nasty crap we put into our animals (and our own bodies with human food!) in the form of unnatural processed foodstuffs. Her coat was never rough, but its so soft now everyone thinks she's a puppy (she is almost 5). She was always muscular and I've never successfully reached her limit athletically, but her mind and drive to work are clearer, stronger, and calmer now and she has filled out with more and much stronger muscle than she's ever had before. And she was already in much better shape than most dogs we see at training (who eat kibble still).
Travel? We go to my mom's every weekend... I stick a cooler in the car with their food. Real tough! Lol.