The planter has
2 hyd drives
2 vac moters
ccs
11 hoses

The tractor has
4 scv 
power beyond pressure
case drain

I need to combine 2 returns.
Can I combine the 2 hyd drive returns or the vac returns?
Should the returns from the hyd drives and the scv's be hook to the side plugs on the scv's to reduce heating?
What is best hooked to the power beyond?
tia