Frank,
You can get a great fixed rate now at lower than the rate you listed. Go for a higher mileage Gen 1 that has had good care and you'll be closer to 30K.
Keep your truck as a daily driver and you'll be set. Look, you have had 900 posts, which means that you are an interested Viper man. My only mistake was to wait so long to jump in and go for it. Each and every time I drive or even just sit in my car, I'm glad for the purchase.
Besides, if something terrible happens, you can sell it, and get out. That is your safety net.
I am 20 mins. south of the Brent Spence. I'll show you my car and let you get a feel for the Viper experience. I am not saying that the Viper is the only or even the best car. But, after owning 55 cars, I have stopped shopping. My next car will be another Viper.