”One of the requirements for the design was amphibious capability, a necessity in certain parts of Sweden. As such, it was amphibious with some preparation”.
It is a useful strategy, if you want to gain SL, to build presets with minimum repair costs. I.e. to select ground vehicles and airplanes by its repair costs.
See “Preset #5 Tank DE 3.7-4.7” ( or even a higher preset ), but with additional Wirbelwind ( BR3.7 ), as the use of airstrikes and so the chance to knock out airplanes is getting better with rising BR level. The SPAA “Wirbelwind” ist the best German WWII SPAA, more effective than the SPAAs with higher BR!
See Russian BR4.3 Preset, but just with BR4.0 vehicles.
The reason to play on BR4.0 instead of BR4.3, is the “BR5.0 Gap” of current WarThunder AB, GF. With Reds of BR4.3+1.0 = BR5.3, you encounter the strong vehicle T-34-85 (D-5T).