My LG is a 5 wide (body) so 80" is what LG spec's. It has almost the exact same track as my JK. LG says the overall length is 12 feet. I figure my tongue weight to be around 250-300 lbs (with the battery and the loaded box in front of the cabin).
As for offroad... I wouldn't consider myself an expert by any means... and I've only ever once hauled my trailer (m101) down the trail. But it was a trail I'd never been on before, and I went with a large group. And my m101 is a fairly light trailer that's very well balanced... so I knew that it could be hand balmed if needed.
I'm not saying don't hit the trail with your TD (assuming you get one)... just that you'd either want to know the trail before hand (I'd watched a lot of video of the one I did), or have a very good idea of what you're getting into... and have plenty of options (bypasses, other vehicles (recovery), turn around, etc). It's just slow going (I was always a LOT slower than the other vehicles) due to how the lite trailer will handle a mid size bump vs a heavy jeep, and over anything off camber or tight I was significantly slower due to having to figure out what my JK was doing, as well as watching the trailer. I knew I was going slow over things... but didn't quite realise how slow until I watched video after the fact.
Once I get a better galley setup (or sell this TD and buy one with a better setup), I figure my setup/take down time would only be a few minutes - as that's all that's really slowing me down.
