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This a flasher schematic extracted from one brand of flashers used on these trucks.

Here is a picture of the speed control linkage.

The hydraulic pump for the crane is driven from a transfer case PTO. The rpm is set with the "throttle" control. Typically, the transmission is in 3rd gear with the transfer in neutral and a rpm setting of 1,200-1,500. To maintain a constant rpm with a varying load, there is also a mechanical...

The M756 uses what is referred to as "stiff legs" in the TM. The M756 truck bed is perfect for use with the behind-the-cab mounted crane, leaving enough space for it and with several other added features, like anchor points for snatch blocks.

There are hundreds of threads/posts showing the old cranetruck on this site, use cranetruck, hiab, knuckleboom, m756, or any other keyword that may be related. I'm not a fan of long threads, so my threads are very much subject related. More images:

The hydraulic outriggers are very very useful by themselves, lift truck for changing tires, get truck out when stuck, lift truck for headroom when working under it, use outriggers for straightening metal pieces and more. If no outriggers, look at the M756 pipeline truck for ideas.

Check compression, low compression = no/difficult start.

Ref your m35 image, is it just the perspective or are the front tires larger than the rears? If so, expect problems in six-wheel drive...no interaxle differentials here. Nice crane, study the mounting requirements and follow instructions and you'll be in good shape.

My HIAB was a 1972 military version and the hydraulic pump was reduced in capacity to about 50% of what would have been commercially available at the time. This was done to slow the unit down and to limit the lifting capacity, all for safety reasons, no doubt.

Interesting, I too had a leaking brass float a few years ago...

With any kind of load on the engine, I kept the rpm at 1,200-1,500 to minimize wetstacking and I put many hundreds of hours on my HIAB over a 15 year period. Having a dedicated small engine for the crane offers more uses for the crane IMHO. A good solid run on the highway now and then will...

If it looks anything like this, you'll need a lot more than a steel plate in the bed for a mount.

He is running on propane gas...

I agree. Always keep a spare flasher around, turn signals are important when on the road.

How is the flow of gas controlled? Is it starving for fuel? How is the oil pressure? May not be related to the stalling problem, but if hard to start, the compression could be an issue...it was with mine.

Reads like a bad regulator printed circuit board.

Nice, now make sure they stay charged at all times and they'll last a long time.

Typical PS magazine battery care/test article Specific gravity is what it's all about.

Chances are that your 6TL batteries have been sitting around with a less than full charge before you (any post military body) got them. Lead acids must be kept at full charge at all times or they will sulfate and won't ever again put out full AH capacity. The personal car batteries will last...

I hear you brother. Edit: Since retiring a few years ago, my budget for the xm757 has shrunk substantially and is in the neighborhood of $50/month and that includes fuel. The truck is driven 10-15 miles a week now and the tires are my biggest concern and limit my range of operation. As things...