Recommendations for printing 90ft solid red panel job? Latex 360

[Notarealsignguy]

But at the end what's the point having a latex if it cannot handle something like this?

You can frame a house with a sledge hammer but it's stupid. Nobody buys these printers to print huge swaths of a single color, it's just not something that they are good at and it is also not a good long term product for your customer. Especially red. That is why they still produce colored vinyl and paint.