If the pets are doggo's - bring 'em! Everyone at Kerrville knows my Nugget. He likes to ride too. Just get a harness and cross tie him. There's a thread on here about that somewhere.
I have 3 dogs, 2 cats, a bird (conure) and fish. I'm also single, but do have roommates who cover while I'm gone.
I will have to pass, I notice my 50lb dog gets fatigued past the twenty minute mark in the passenger seat. She is always fidgeting trying to get fresh air out the side the back to sitting upright looking forward. I am also not to keen on exposing them to long term noise levels with the engine and tires at freeway speeds. I am getting them both some cool aviator leather hats and UV sun goggles for my terrier who is always poking his head in the airflow above the screen and probably for my girl in the passenger seat as well.