You have 20 levels in every class - What subclasses do you take?

[Arkhios]

For tristalt, you mean 3 classes at once? I would personally say Barbarian/Champion/Ancient Paladin because I like the idea, not because it is optimal. A neat one would be to switch Barbarian for Draconic Sorceror for the flight and still consistent damage and large Smite capacity.

I, for one, would do almost exactly the same, except I would choose Cavalier over Champion, because this combination would fit perfectly for my current character who is a self-proclaimed tank of the group, a ferocious warrior, and a devout servant of the Old Faith and a follower of Kord's teachings. For Barbarian's Primal Path I guess Zealot would be the most appropriate as it befits a follower of Kord (not to forget that Zealot adds some serious oomph on the character's smiting ability!)

If I recall correctly, Elven Accuracy and Reckless Attack do not mix, due to Reckless Attack using Strength based attacks.

Correct. Elven Accuracy only works with attacks made using Dexterity, Intelligence, Wisdom, or Charisma, while Reckless Attack gives you advantage only on attacks using Strength.