in my honest oppion, the most in important thing is to have clean traps, the rest is trivial. your never going to make a set and not tell a K9 that you wasn't there. it takes about 24 hours for your sent to disperse, then after that your good to go as long as your traps are clean, if your trapping water,(coons,mink,muskrats and beavers,) then scent control isnt important at all, if your trapping coons on land, its not a problem either, but I feel its not a problem around here where I trap for K9's, I just go and make my sets on travel ways and I don't wear rubber gloves, and all that other stuff,
look at it this way, its just more things you have to carry. and a good trapper goes as light as he can. now if your out west and are trapping areas that doesn't have a lot of human activaty, then it might be important to use that stuff, but here in Ohio, I dont think it is, since the yotes will follow your steps in the snow to see what you was up to. good luck and happy trapping.