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Yah, the only issue with going 16", is every ranch horse trailer in world uses them too.
The odds of finding a good used one in a pinch are getting tough.
Especially during the summer when people and horses travel until the fall.
Spare 16" good used tires are like hen's teeth in the mid-west.
New are getting close to $250 for a good 10 ply trailer tire, let alone a quality highway tire.
The yards are scrapping all the 16" steel rims, so they will not sell them unless you are a certified repair or autobody shop, where I live.
Find a small town autobody repair shop and have them order you rims from the service database system they pay to be on, as a certified repair shop. They will have dozens of yards that will supply them what they refuse to sell you, in good to A+ condition, but only through your autobody professional.
They can order you wheels from yards all over the country, yards that will absolutely tell you they have NONE IN STOCK, if you were to call and ask.
The shipping is the issue. Get ready to pay a premium on a premium to what what you want in good OEM quality steel wheels.
The Russian aftermarket thin steelies seem to be missing from amazon these days?
YMMV
Old Guy Bill is way smater than you think... availability for wheels, check...
Tire sizes and ply ratings with quality manufacturers? check.
Availability of a good usable spare... maybe, if they are not poor quality returned warantee tires?
In a pinch, in a small town, when you need emergency rubber? 17's might be best?
What do you guys think?