When you travel it is often a good idea to keep your dog in a dog crate. Especially, if the dog rides in the back of an open pickup box.
Dogs are den animals so crate training is easy. Take a travel crate in the house, leave the door open, blow your whistle and verbally command “Kennel UP!” as you toss a bite size treat or chew bone inside. Leave the door open often during the day if you are home so your dog can enter and leave as it pleases.
Be sure to throw an old jacket or shirt you have been wearing inside for a bed. If your dog runs off from home or while on an outing, you may have to give up the search to go home and to sleep. Leave your crate outside with your jacket in it… your pup may just be in there waiting for you in the morning.