I’ve had pretty good luck with my 2009 T4. I bought it with 1300 miles about 6 years ago. I replaced the fuel filter and treated the electrical connections with some dielectric grease...Replaced the starter also at around 3500 miles. Had to reinforce the weak rear trailing arms and had to update the differential ring gear bolts, but it’s still running fine after 6000 miles. No engine or transmission problems. And it’s pretty simple to work on. Parts can be had from Casey Ye or Joynerusa.com. Oh, I’ve replaced the wheel bearings also. The Joyner Trooper has never left me stranded on the trail, in fact, I have rescued the razor guys with broken axles on more than one occasion!