I have two 6000 pound straps. It will certainly make it easier to use the bed web. When you say choker the second strap to the left end of the headstock, do you mean loop around the spindle, or is there another point that can be wrapped around?
Spindles is stout enough, but I cringe at that. REALLY cringe..
The strap itself should NOT have anything but a direct loop. The choker is a separate critter, no need for it to be all that stout. Could use a lighter and longer strap, for example.
We used some plastikote covered hooks I traffic in, edge of casting, then secured the span by snugging-up with flat ratchet straps so it couldn't get loose and/or shift position.
That was on my '42, and the wrecker lift carried a VERY stout 4' x 6' pallet with it. Full two-inch dimensioned lumber, bottom deck as well as top, and through bolted, not lag-screwed.
Used an 8K or 12K lb rented forklift to take it out, this end. Very uneven surface under, so that was more worrisome than the hook that we had picked it up with in Durham, NC. Also cost about four times as much, what with drop and recovery charge.
The '44 arrived here on a good trailer, PO had a toe-jack, steel channels, mid-point suppport goods, and a shop-fabbed skate & cradle frame to place under it.
Lowered it down the ramps with his electric winch. Tail of the trailer and ends of the ramp clear inside my space, so all we had to do once on the flat was run a hydraulic garage floor jack under each corner to slide HIS skates out, and replace with a spare set of my Northern 4,400 each 'purple' ones.
Thing to remember about a 10EE is that it is top-heavy, can face-plant either direction, or even go TS arse over HS teakettle if on a ramp 'coz the HS end is so much heavier than the TS end.
The cast covers can crack in a New York Minute as well.
Tubes, BTW, if yah have those, need REALLY special TLC.