I'm an ABDL and yes I wear diapers on a road trip as an ABDL.
I wear diapers all the time and don't use the toilet for either poop or pee as diapers are my toilet.
I find diapers much more comfortable to wear than underwear or boxers and diapers are much more comfier when they are wet and have swelled up due to the SAP getting wet.
Walking around with a wet squishy and saggy diaper is a wonderful feeling.
Sitting in my truck driving with my diaper on and wet makes the ride more comfortable.
I also have a small camper trailer I pull behind my truck and go camping in and when I need to change my diaper I can get into my camper and change the diaper and take a shower if needed.
Wearing diapers on road trips is very fun and convenient as well as there's no need to hold your pee in to go to the toilet.
Just pee the diaper and change later.
Nobody is gonna know you're wearing the diapers anyway.