Generally air bag systems designed for regular Hwy use are tied together to one air line on each axle or tandem set. We can then use one levelling valve to adjust each axle or tandem set. This equalises load at both ends (left/right) of each axle or set.
The crossover of air between a set of bags is quite slow so unless you drive continuously in a circle with heavy loads you will never have issue with leaning or unbalanced pressure. The goal is equal pressure on both sides under varying load/driving conditions.
Check your prov/state regs to determine required configuration.
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View my fuel log 2014 Mirage SE 1.2 automatic: 45.3 mpg (US) ... 19.3 km/L ... 5.2 L/100 km ... 54.5 mpg (Imp)