I Just finished moving from Northern California to Southern California, a 614 mile trip. I was towing an 8 x 10 trailer, fully loaded with our belongings, it felt about Max tow capacity for our fj62(about 150k on it). We stopped before crossing the grapevine(tejon pass) into LA, a long steep 6% grade slope, and let our rig cool down a bit before making the climb. We got through fine, albeit very slow, alternating between second and third gear. About 40 min after making the pass, the car seemed to slip into neutral for a moment, just revving when I attempted to accelerate. I eased off the gas and it went back into gear. It drove fine the rest of the trip maybe doing that one more time. the next day we drove to my moms house, a 30 mile trip, and it drove fine, other then I remember it it took a little longer then normal to shift from third to fourth gear. On our way back our rig seemed to slip out of gear again. I stayed in the right lane, anticipating any possible problems. Not much longer and it slipped out of gear again, this time not going back in. Emergency lights on, we pulled over to the side. Our Truck was sputtering and shut off. We were in a bad spot so I attempted to drive a little further up to a safer pull out. Managed to get it there, but it was sputtering and the power steering didn't come on. Got our first tow the remaining 10 miles home. Now trying to figure out what happened. I checked the obvious, oil level is fine, tranny fluid is fine, ( just changed it a couple months ago). I have little mechanical experience beyond normal maintenance stuff. Any ideas on what could be going on? I hope my transmission isn't toast. Thank you.