Literally years after I bought a gantry crane for this, which I never used. A winch that I never unboxed. And so many nights of tired to figure out the easiest way of getting it done. I realized I was way over thinking it and I got tired of looking at the rafters and the winch every day -- so I just pulled the trigger and rigged up this thing. Works really well.
Basically I wrapped a couple of ratchet straps around the RTT. Then brought them together with a 3rd strap that connected to winch. And just like that, it came straight off the rig. (Note: when I first set up the RTT, I bought extra cross bars for the RTT that I planned to permanently fixed to the RTT, so I could just unscrew those 12 bolts and take the RTT, still attached to crossbars off and back on. This was my plan all along. I've had this RTT for at least 3 years -- so yeah, I've really been procrastinating on completing this ultimately very simple operation.)
The winch is bolted to length of steel square tubing which is bolted directly up to the rafter. A couple of strong ties are added on each end of the square tubing to reinforce.
Added a couple of fat eye bolts to the rafter and after the RTT was hoisted up, used webbing and some locking carabiners to equalize weight.
I'll still need to finagle it a bit more -- but I'm stoked to be able to take it off and put back on my rig by myself with a little bit of effort. With a second hand it's super easy.
Ironically, I did all of this and took off the RTT just before climbing season. So I'll probably be putting it right back on my rig pretty soon.
Thanks for all the help. It's great to have the RTT off the ride for a while. It's to be expected, but nevertheless shocking, to experience the drastic change it makes to the handling and ride of the rig.