Here in OZ, you might fall foul of the annual road worthy inspection in the states that have them.
To avoid this, they should be wired as indicator repeaters....not cruise lights.
The problem is that as no one runs cruise lights here in OZ, idiots may mistake them for indicators.
The rules are a bit contradictory.....
It's not clear that cruise lights are illegal here, so you'd be relying in individual interpretation of the rules by testers, authorities et all.
But you'll have no problem using them as indicator repeaters, providing both the front and rears are amber, red on the rear will not be deemed acceptable.
However, if it is a heavy vehicle or a trailer then side lights that light up amber to the showing forward and red showing to the rear, and light up with the tail/park light circuit must be fitted to each side.
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"
'80 Triumph TR7.
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'83 Jaguar XJ6 Sovereign S3.