How about combining LT of your character with you’re horse LT?

 

Or maybe make it like:

Horse Tier 1 gives you 20% boost to LT

Horse Tier 2 gives you 30% boost to LT

Horse Tier 3 gives you 50% boost to LT

Horse Tier 4 gives you 70% boost to LT

Horse Tier 5 gives you 100% boost to LT

 

Or maybe just delete it as it just seems utterly pointless to have horse storage which requires to manually move items, a specially in game where you auto play like +90% of the time.

Speak for yourself, my T5 is loaded up with 3100 lt worth of potions.

So you can go back to town only to sell junk, not to sell junk and buy potions. Usually I run out of space faster than out of potions.