That is for a trickle charger. I use Battery Tender brand.There no way that $5.95 connector in post #14 is good for any winch let alone 'jumping' any tractor.
Might be good for 10 amps ?? Most battery 'tenders' / maintainers only put out 2-5 amps.
To the OP: Why are you having to jump start your tractor frequently?....
And this thread's Title... "Easy access for jump starting and charging", Are two different issues.
Solve the issue with the battery... Battery Tender or similar.
Jump Starting should be a last ditch effort, NOT a planned program. Batteries have been known to explode in a jump situation. Just sayin'.
If your tractor sits in a field with no AC power nearby, get a solar powered battery trickler.