Okay, it is an LJ. That motor is prone to problems compared to the engines that come in heavy duty models. It seems to be priced pretty fair though. The Light duty models are more of a comfortable ride since they are not solid axle. Edit: me big dummy.
Also, they usually feature more power options / "luxury" features (still pretty basic though).
If I was you I would research light vs heavy duty 70 seires pros and cons and decide which sounds like the right type of cruiser for you.
Heavy duty models are usually more associated with being bullet proof, no nonsense tools to take into the middle of nowhere. Light duty are slightly more comfortable to drive around town but still very capable off road. That is probably the most vague summary ever of the two but you get the idea.
As for what to look for on that model if you want to buy it I would place most of the importance on the maintenance history of the engine.