As an aside, I looked at the stats for the Loxo in
Shining South guidebook and it stated the size of the creature, and it was actually the same height more or less as a goliath. So it could be classed as a medium sized creature.
Anyway, here is my stats for it. Shame WoTC didn't put it in the
Sword Coast Adventurers Guide and have it Adventurers League legal. Sure would raise a few eyebrows in Icewind Dale
Ability Score Increase – Your strength increases by 1, your Constitution increases by 1 and your Dexterity increases by 1.
Size – Loxo stand between 7 and 7ft5, and weigh in the region of 500 pounds. You are a medium creature.
Age – Loxo reach adulthood at 12 years old and can live to over 80 years old.
Speed – your base speed is 30 feet
Trunk – You have can attack with one of your two trunks and inflict 1d6 of bludgeoning damage. You can also use your trunk to perform an additional object interaction on your turn if either hand is empty.
Natural Armour – Your AC is 12 + Dexterity modifier + any armour you are wearing
Trample – As an action, you can move over creatures of medium size and deal 1d8 + your strength modifier + proficiency bonus of bludgeoning damage. The opponent can take either an attack of opportunity with disadvantage or attempt a dexterity save (DC = 8 + your proficiency bonus + your strength modifier) for half damage.
Languages – You can speak Loxo.
As for the size, the Dark Sun group I DM has a Half Giant (a 12 foot tall, 1200 pound one) and he cannot go places the others can, has disadvantage in certain areas and has to eat and consume twice as much food and water as the others in the group.