Don't sell old tech chain short. One thing you can do with chain that you cannot do with synth line is winch with it for the entire length of the chain. Most people hook one line to one end of the Highlift, and a second line (be it chain, cable, or synthetic rope) and cycle the Highlift to pull the two ends together. They they slacken everything (including the vehicle) and hope the vehicle stays put. Works fine, for maybe 3 or 4 feet. And if you can't hold the vehicle from sliding back..then what? With a chain you can hook a short chain across the span of the Highlift and hold the vehicle where it is when you slack off on the jack. Lengthen the jack, re-hook, and pull again against the still-tensioned chain. You can keep that up for the length of the chain.
Synthetic line is good as an extension for the chain. BTW, you can't use synthetic winch line for dynamic pulling either, just like chain.
As for size of chain, check the charts and decide for yourself, but I have done a lot of Highlift pulling with 1/4" chain. I'd challenge anyone to pull that in two by way of Highlift jack. A human, moving the handle horizontally, can't get anywhere near full 7000 lb rating out of a Highlift. A length of grade 70 chain in 1/4" link does not weigh, or cost, that much. It stores well in a sack, and fits in awkward places (much easier than a coil of cable, IMHO).
Originally Posted by supesazpd
U-1300L Unimog with 10' Alaskan camper, OM-366A turbo-Diesel, fast axles, overdrive, Werner 12k winch
Various other mogs for work and play.