Try getting 30 or 20 legendary crates or 200 or 100 legendary crates. 30 legendary crates worked for me but i would knly get hulls. I basically have all of the legendary crates hulls except for the turrets
i dont rlly like the tkx-90 since the most of its armour can get penned by tier 9 and up cannons making it pretty bad at most things, and it doesnt get an autoloader