The Sword Coast Adventurer's Guide adds the Elk and Tiger totem spirits as options for the Path of the Totem Warrior barbarian. The Elk totem option for the 6th-level Aspect of the Beast feature (SCAG, p. 122) says:
Elk. Whether mounted or on foot, your travel pace is doubled, as is the travel pace of up to 10 companions while they’re within 60 feet of you and you’re not incapacitated (see chapter 8 in the Player’s Handbook for more information about travel pace). The elk spirit helps you roam far and fast.
I am looking at the level Elk Totem's ability for my next level of Barbarian. Currently most of our travel time has been on foot, but our Noble Half-Elf Ranger wants to get herself a horse-drawn carriage. Would the travel pace of the carriage be doubled by the Elk Totem's 5th-level Aspect of the Beast?
Since both mounted and foot travel is covered by this ability, it would make sense that land vehicles should be as well. Water vehicles and magic vehicles would not be affected. Is my assumption correct?