How well do you know your tire guy. I trust my tire guy, wife taught him for six years in grade school, he wouldn't dare give us a bum steer. When he says XXX brand will do that job, I'll buy XXX brand. On other applications, he'll say he doesn't stock anything he can recommend, but I can order YYY to do that. YYY is usually a name brand premium tire, and the application is a special one.
Before we built this relationship, I bought only name brands.
I don't know Gladiator, my tire guy doesn't handle it. But if you trust your guy, and he recommends it, I say go for it.