nicoleandkyle wrote: Thanks, Tim! We are interested in switching them out, so I'm interested in seeing the ones you are talking about

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So, here is a recent photo of the TD with the baby moons installed. Sorry, not the greatest shot, but, you get the idea. This is on my TD so there will be some differences in appearance I will go into below.

As with all TD builds there are many ways to approach this and my version may not be the best. It's just how I did it. Do a little research before buying.
The baby moons are from etrailer. They are intended for a "conventional" automotive wheel with hubcap mounting nubs on them. With your 12" wheels (and mine which are 13") You will have to buy clips to install them. It's a matter of drilling an 1/8" hole at just the right place on the wheel and then pop-rivet them on. I used four clips per wheel, some folks only use three per wheel. I found the clips from an Amazon vendor. I had trouble with the original batch they sent me (were brittle and snapped in two) but the vendor sent a pack of replacements very quickly. I've traveled around Lake Huron and back home, about 1500 miles, and another trip of 300 miles with no problems.
Baby Moons
https://www.etrailer.com/Accessories-and-Parts/Americana/AM90086.htmlInstallation clips
https://www.amazon.com/gp/product/B007X5HLJI/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1Full disclosure here, the pictured TD is not on a NT trailer, but my custom made trailer from a local welder. However, on my brother's TD which
is the same 5x8 NT trailer as yours we did the same upgrade as with my TD swapping the 12" for 13" wheels from etrailer -
https://www.etrailer.com/Tires-and-Wheels/Kenda/AM31233.html The upgrade was an expensive one, but, I like the handling and appearance of the 13" wheels and being a commonly sought size for utility trailers I got $80 for the set of 12" unused NT supplied wheels/tires on craigslist to offset the cost.
In addition, we did not use the NT fender, instead buying the 13" version from etrailer (might not be necessary in your case), and we had to buy spacers to bring the tire/wheel out away from the trailer frame as the Kenda tires were wider than the stock 12" tires on the NT trailer and I was concerned that in some rare instance when cornering the 1/4" clearance between the tire sidewall and frame bolt heads wasn't enough. We wanted to avoid the possibility something may happen, so 1/4" aluminum spacers were added on each side. So, it wasn't a simple - buy baby moons and pop them on. Just want you to be clear about that. I'm glad I pursued this a couple years after the build as I had enough to work on during the build.
Good luck. I'm really interested in how your project comes out.
Tim