Well I finally have Pistol out here on the ranch. We've been working the last couple of weeks on riding and staying in the bed of the pickup. After a few hiccups, she finally stayed in the truck on her own will!
But we are making progress on riding in the truck. Pistol is almost too timid for her own good and is scared to the point of shaking when she is in the truck. I have not a clue what did it, maybe it was the jumping out of the side and hitting the ground? Any way, I had to tie her in the bed of the truck to get her to stay, and eventually moved to untying her while in the pasture. I kinda approached it to sacking out a horse, if she is scared of the truck, then I will leave her tied in there for a while and reward her when I let her out.