I have serviced similar with timber or decent tie blocking and a pair or air over hydraulic jacks. I will be in nearby germany for most of this year if you need help from a wreck master of sorts....

I agree with Dennis Storzek about the dangers of jacking one end only. 4 jacking points for the best stability. Or take it outside the shop and use a crane. What's most important is lessening or eliminating death and injury . After that what's next ,damage to equipment , costs , timeliness , convenience ?
Other than that I can't give suggestions without being there. Hope it turns out well for you.

I've been watching and thinking...... we don't use plate frames over here. Plate frames are more rigid than our bar frames, but less forgiving. The strongest points at which to make the lift are where the side plates join the end plates. if you can use needle beams to stretch from one side to another and support it at those 4 points, I think you will eliminate the possibility of deforming the thin ends of the end plates, especially as no lift with multiple jacks is entirely equalized - all will lift a little differently than the others. It may be possible to place the beam on the rails so the jacks sit on the beam to get them where they need to be - we aren't there to see the geometry. I presume the side frames are inside the drivers as is common practice for inside plate frame construction. You will of course need to use a raised beam at the front to clear the truck being rolled out from under. the narrow jacks somewhat concern me - if cribbing can be raised to support the beam ends in case the jacks should start to lean or wobble, it would be a very good thing.

Status update:

The plan is to remove the pilot and jack from front only, keeping the lift a minimum.

Note the photo showing preparations for removing the cylinder head. We want to inspect the bores and maybe change the rings. These cylinder heads do not clear the truck. The truck either must be removed, or it can be derailed and shifted over to the side a few inches.

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Yup. I believe we are going to do inspection on the truck this time. Maybe some bearing work. Revise lubrication fittings.

Update. Hold on to your hats. The truck is out and the front end is on blocks. Again, I was not there (peak work cycle is semester start). The engine was jacked from the front only.

That looks--terrifying. I wouldn't have any part of my anatomy I was particularly attached to anywhere under that setup. I wouldn't even stare at that trigger...I mean blocking point, too hard, for fear it might move. Best of luck to you, and always watch out for #1 ;)

I wouldn't even crawl under there if it was a pickup truck.

Please put some additional blocking/cribbing under there before you work on it, breathe on it, or even give it harsh glance. Even just stacking some ties under it would be something.

Well, keep in mind we can't see what's immediately behind it. It may be well balanced on its drivers.

if those are concrete blocks on those rollers, one good crack the whole thing slips/rolls.

get some ties under there, block those rollers. Put ties on either side of those rollers, block them secure them.