Ok, so we’re neither talking about the truck nor the trailer in your signature. Got it.
Tires for the truck? The dodge? Sure, um, whatever fits.
You’re the only one who knows what rims you have what rims you intend to buy or what vehicle they’re going on.
Trailer tires ? 16s are the obvious choice and most are going to be different size than what you’re running on a HD truck unless it’s a dually (235-85-16 is the common denominator here), in which case the offsets will be so far off it’s not practical.
Not to mention hub size, lug size/type, etc make sure all that works for the ability to swap, as well.
So until you’re specific on what truck, what trailer and what tire size, to your original question, yes 16” LT and ST tires are still plentiful and common.
Brakes? You asked if it was worth the expense. IMO it is not, nor the added maintenance of a hydraulic trailer setup.
That said I would not turn one down, I would just not prefer it for less than fully loaded daily use, where the benefits may outweigh the maint and initial expense.
