Same happened to me, couldnt get the bar past 0 experience no matter what I did. So I thought it was maxed already. And then invested a lot of time leveling and farming crystals for that reward. People did that all week, like serpentis and regular dungeons farming one crystal at a time.
Idk...
Can we get a better recipe to craft a farm wagon, instead of spending over 2k gold to get a 4 packs vehicle? Even if we need a store item for it, like the hauler upgrade ticket.