We traveled FT for 7 yrs. with a 68# female Border Collie/Lab mix.
We would take her outside and have her do her business (she would pee/poop on command----before getting into truck, during travel at rest stops, before we went anywhere, on walks etc.) then leave radio/TV on (depending on what she wanted) and go sight seeing, shopping, taking care of business as necessary. We would be gone for up to 6 hrs.
She would sleep.........at least that is what we figured she did.
During our first year we would ask neighbors when we got back if they heard her, any barking issues etc.
After "NO we didn't hear your dog" we quit asking and never did we have any complaints.
How do your dogs react now to being left alone.......that is basically how they will react in their new home.