yes, always use 4, or the entire weight will be supported by only two tires, likely damaging the sidewalls and increasing the risk of a blowout.
we've had good results using Lynx Levelers ( the orange blocks ).
__________________
jdyson
(former owner, went back to Class A)
(but enjoyed our brief 'experiment' in downsizing!)
'16 Forester MBS 2401R
Hellwig 7254, TireMinder A1A & Sumo Equipped
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