What vehicles do you think are purposely fun to uptier? Just like bring a vehicle up to a tier its not suppose to be like Sturmtiger at 12.7 or maybe Yak-9K at 9.0.
L3-33 to 12.7 is a good one
Howitzers are fun to put up sometimes because you actually have decent killing power
SAV and IKV to 7.0-8.0
Sd.Kfz.222, 15cm slG 33 B Sfl. and Leo2PL is a good lineup
AMX-13 ss.11
If you sneak onto a flank, the auto loader is typically lethal, and the canted launch rails allow for fire from behind cover