I guess you didn't read any of my responses? If you get 1 RE squad into cover before the kuble starts firing (or at least as close as possible), it can force the kuble off or even kill it. A second RE squad will just secure the kill. 1 and even 2 RE squads is pretty cost effective to negate a kuble....
I guess you didn't read mine either because I wrote the same thing...
Anyway, the RE solution is just for US. But I have found that it works the same for the SU with the engies.
Actually, even if you don't get in cover like buildings, you can make it by kiting the kubel, staying behind it. It does require catching it off guard not having set up or approaching outside of the cone. Or else'T' key is recommended.
Disclaimer: I mostly play team games...