Elio, if he was the one planning the road trip

1) Designated Driver (Driver's Seat): Elio would most definitely be the group's chauffeur - pulling up in a luxury-brand multi-seater to enhance the road trip experience; both the size and model dependent on how many people are going on this road trip. Naturally would have the stamina and concentration for the long haul, chauffering his friends to and back without a need to switch drivers in between.

2) Navigator (Front Passenger's Seat): Goes hand-in-hand with the 'Designated Driver' role since Elio will primarily rely on his modified Rotom Phone for directions - which not only is directly linked to his luxury car's GPS system, but is handled by [Proton, Neutron, and Electron the Rotom Siblings] in rotation; as both the car's GPS system and Elio's modified Rotom Phone have an automated voice function for both easier directional management and use for emergency calls - said siblings use them to talk to Elio and the others while on the road as they provide support for the group.

5) Other (Road Trip!Dad): Essentially, to assure that the road trip goes along smoothly and with little to no issues whatsoever, Elio would be the most responsible one in the group - always doing basic inventory checks, assuring everyone else have what they need prior-hand and during the trip, and he's prepared for any possible detours and complications that may arise (ex. first aid kit, backup credit cards/hidden cash stash, additional chargers + power banks, emergency numbers, basic survival kit, etc.). For a good visual of this role: (https://www.tiktok.com/@johannes2o/video/7211075879085018373)

Elio, if he was invited by friends

5) Other (Roadtrip n' Chill [Backseat]): Elio would leave the planning to his friends and just... relax. He'd be in the backseat with his headphones on and probably just nap as he periodically would whenever he was journeying in a different region - only waking up when sensing danger or the group near their destination. If the group is facing trouble of some sort, he'll do his best to give them advice on how to approach the issue and provide basic assistance so as to not usurp the planner's leadership. If things go south, however, he doesn't mind momentarily taking over until everything's back on track. But yeah, he's just there for the enjoyment (and free food), all expenses paid.