I have a friend that used to be the Minnesota chapter, co-leader of Minnesota/Wisconsin Chapter of TearJerkers, Teardrop Trailer club. He said to pass on to the group here, that the TearJerkers welcomes anyone that likes to camp at their gatherings. I have belonged to the Teardrop & Tiny Travel Trailer (TnTTT) group and the TearJerkers (TJ) group for several years and have found them to be great folks... and still camp with them when plans work out!
In addition, many of them have built and or modified (personalized) trailers and campers, and can offer great ideas on trailer builds. I started out with a custom built Cargo Trailer Conversion designed for off-road travel that stood 24" off the ground... I posted the links, including my personal gallery, below (AZ_Desert_Rat).
Here are the links to TnTTT, TJ, and my personal Gallery...
TnTTT: Teardrops n Tiny Travel Trailers • Index page
My TnTTT Gallery: Teardrops n Tiny Travel Trailers • View album - AZ Desert Rat - Trailer Albums
As there are a number of FF owners in the upper Midwest and a bunch of Tiny Trailer owners here, a mixture of groups sounds good, and as we all build and personalize our trailers, a mixture of ideas is great...