I've owned a T-REX for about 4 years now and I have to say "amazing" on what it can do off road (stock). What you have is twice the machine I have but mine can still scare the crap out of me.
When I bought mine and used it for the first time I too sold my off-road stuff and made my bronco as you call it a "mall crawler". I say go for it.
When you get 30K and thousands of hours into a bronco, and it can be destroyed in a matter of seconds off-road, I think you are a smart man.