All tanks have limitations in different terrains. STRV 122 is made for sub arctic enviroment, merkava is made for desert mainly, M1A2 is a bit mix between desert and "woodland" same with Challanger.
I doubt that Merkava would perform good in Sweden. M1A2 had even problems in noth Sweden, the one that performed best in our terrain was the Leo 2 S (which was formed into the STRV 122)
STRV 122 and posibly the Leo 2 would most likley do poorly in desert as its not made for it. Leo 2 and its variants are made for europe.
Devin, they are holding your life and they will never let go! Come home safe!