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It will be pretty high amperage and yeah, extended cranking will build heat. The most likely cause is less than optimum connection at the quick disconnects. Extended cranking is also quite bad for the starter. The cables will cool down much faster that the starter windings so do not just allow...
The amp rating for the cable posted before assumes continuous use. You can put a lot more though cables for short term. Consider that much smaller cable in a civvy truck handles 200, 300, 400 amps regularly. As suggested, be mindful of heat buildup. Also, make sure to string out the cable...
Spacing is a good solution, I just had not thought or heard of doing it that way when I did mine. I would have needed to buy or otherwise obtain 3 inch channel.
My local Tractor Supply Company has a pair of LED floods for $40. They are univolt (9-32 volts). I have put LED floods under the bed of my trucks, pointing to the sides and back. On my deuce, they are about centered over the pivot between the two rear axles, up high under the bed near the frame...
The axles are vented BUT, the vent has a spring over the disk that has to be overcome in order to vent. That does to a small degree, force differential lube past the seals (which are more like shields) to wash out the bearing grease and eventually to lube the brakes. Those that tie the vents...
I used a big truck cab shock that is the bomb on the deuce. Real stiff so it does not move much in the bouncy stuff but I think of that as a good thing. I have replacement Monroe's for the five tons. I am not currently able to provide the part numbers for either but could with time.
That's why I have five trucks (2 chivvy 4x4s) for inclement weather. One of them is bound to suit the need. M939 series 5 tons are comfy (er) and warm (er) albeit with an Allison tranny.
If you decide two is the way to go, I would at least suggest group 31 in size. The smaller the batteries, the less cranking time you get. Fine for when all is well but not so much when problem appears. Just a simple fuel filter change can require some serious cranking events. I have two group...
Might I suggest a Pontiac engine (400, 455) instead of the Chevy. Pontiac engines came stock in GMCs in the late 50s (not real common knowledge). I have a 56 GMC that was an original V-8 truck. Some also came with Olds V-8s, but never a Chevy. A Pontiac V-8 generally trumps a Chevy for low end...
I'd say serviceability is included already. Any monkey can work on it (just look at us). The monkey must be able to read though.
My trucks have been quite reliable, given their age.