I hope you can get the info you need from Tucker. Not good that they are not getting back to you.
I ride a Tucker Plantation, my husband an Old West Trail. Both wide trees. We are very pleased with them. I have had mine for several years and it fits husband's gelding so we felt relatively safe in buying his used online. It's a nice piece of equipment.
I also have a friend who rides an Imus. She loves it.
If you ever find yourself in a fair fight, it's because your tactics suck. ~ Marine 1SGT J. Reifinger