In RouterOS you can set QoS priority 3 to outgoing VLAN packets using this rule:
/ip firewall mangle
add chain=output out-interface=GoogleVLAN action=set-priority new-priority=3
Thanks for the help.That is correct, you got an IP without that line active so you could also omit that line.
Can't test because I am not even on the same continent.
Which should be done per router.Dumb switch and both routers being independent won't go well with the requirement to control other router's bandwidth (on first router, as I undertand it).