Well it looks like I have fully succumbed to Takitis. I added a TOA 150 to my lineup. As you can see from the photo's it's rather... large. Dan from DiscMounts is the one who tipped me over. With his method of mounting it the scope goes from "bloody hell this is heavy!" to "OK. I can mount this." He recommended I cradle it in both arms, then cradle it with one arm and rest it against my chest/belly as I roll it into the DM6, using the off hand to lock it in place.
dr who, perhaps you could try the method that the Greg uses for his C14 scope in his YouTube videos? He has an observing chair (you could use something like a sturdy box) which he places next to the tripod between the legs, then stands the scope upright on the box, objective lens down ( you could leave the lens cap on) then aligns the mount saddle verticaly with the scope dovetail and attaches them together, then swings the scope to the horizonal position, with no lifting needed.
Rex, thanks for that link and reminder. Saw that entertaining clip a year or so ago but haven't tried it yet.
Guess it's hard to teach an old dog new tricks.......