What is street legal very much depends on where you live. Emissions, fender coverage, lift laws. There are loads of reasons that a vehicle might not be considered legal, all dependent on local laws, and law enforcement.
The only issue I ever had with my t18 was the gear spread. Trail riding up the long hills in a place like Harlan or Windrock it would either be screaming in 2nd, or lugging down in 3rd trying to keep up the pace. For crawling it was great. Drop the clutch and steer.
I gave it up for an aw4...
I got out to AOP in March. Ended up with a pretty good group. It was slick as snot. I ended up with a fueling issue that cut my ride a little short. I just got that fixed up and it's ready to go again.