Mark,
Yes in theory and use #16 or #14 wire.
In theory-BUT-check amperages.
Can your alternator handle all the amperage without drawing from the battery?
I say this because many CUT's don't have all that high alternator outputs!
Generally speaking you'd want total load to be at about 75% of the alternator output.
The other 25% is the reserve to charge your battery.
Also the majority of switches are rated at 10 amps, so you'd want the lighting to be at or below 10 amps otherwise you risk 'welding' the switch contacts.
I'm not a tractor electrical expert (but did wire many aircraft for a living) but on some that I have looked at I have seen 25 amp alternators, and that is not a whole lot, especially if you have a heater and start adding additional lighting.
Those heater fan motors can actually draw more than many lights.
Another item that is high draw is a rotating yellow beacon (dual sealed beams).
Getting to 'brass tacks', you really want to do an 'electrical load analisis' to best plan power management.
Barring that, an amp meter is never a bad thing to install.
In aircraft an amp meter acting as a 'load meter' made it permissable to add whatever we wanted as then the pilot could manage his loads.