Don't know of any trike mags. You're already on one of the best informational sites for everything trike. Check out https://www.triketalk.com/forum/forums/239-Trike-Travel and https://www.triketalk.com/forum/foru...ustom-Products.
DK Product has a ton of videos on both Trike products and a ton on trips videos covering alot of the best riding to be found in this great country.
I'm many of the other member will add their suggestions as well.
Have a Merry Christmas and a blessed Happy New Year!