The Pre-Cut Fender Back # 12FB-32R is made of 16 to 18 gauge material; so there are not some that are 16 gauge and some that are 18 gauge.
This fender back, which is designed for etrailer brand Trailer Fender # HP56VR, has varying thicknesses between 0.048" to 0.057" which is why there is varying gauges listed. view full answer...
This etrailer Trailer Fender # HP76VR is not galvanized. The reason for that is that these fenders are a weld-on application and it is not recommended you weld galvanized steel for health reasons. view full answer...
I don't have the detailed material construction for the Plastic, Single-Axle Trailer Fender w/ Top and Side Steps part # PF11X35W unfortunately but I do for the Fulton Single Axle Trailer Fender with Top and Side Steps part # F008573 which is pretty much the same and more cost effective. It is made of polyethylene. view full answer...
The Single Axle Trailer Fender w/ Backing Plate # HP97FR has the backing plate tack-welded to it.
If you'd rather add your own backing plate then you'll want to go with the Single Axle Trailer Fender for Enclosed Trailer # HP37FR which is the exact same thing, just without the backing plate. view full answer...
I'm glad to hear that you are happy with your Tandem Axle Trailer Teardrop Fenders for 14" to 15" Wheels # HP44VR!
They are cold rolled steel that is bare metal so you will need to prime and paint them, or even have them powder coated to make them corrosion resistant. view full answer...
The CE Smith Steel Step for Trailer Fender # CE19012 that you referenced is not made of stainless steel. It is made of 11-gauge steel that is intended to be primed and painted before being bolted or after being welded in place. The matching part for the opposite side is # CE19011. view full answer...