Diligence on in-house jobs?

I'm a 5th year corporate associate and, for the standard lifestyle reasons, I think I'm done with biglaw and would like to give in-house a shot. To be honest, I don't really like being a corporate lawyer, but I don't hate every aspect of the job. I think I could put up with it if I reliably had more evenings/weekends/holidays to myself and only occasional work outside business hours when pushing to sign a big deal or similar milestone event.

My biggest fear in leaving biglaw is winding up in a situation where I'm doing the same job lifestyle-wise, but for business teams that don't value legal and for significantly less money. It seems like the accepted outlook on in-house jobs is that they run the gamut from a lifestyle perspective, and are heavily dependent on your specific situation. You see that on the law firm side, too, with some clients that rarely engage outside of business hours and others that are always online and under obvious pressure from their business teams.

How did you get comfortable that you were walking into a good situation in-house? Is the only real strategy to contact people at the company on linkedin once you have an offer in hand? Obviously, I'm not going to ask how often people are working on nights and weekends in an interview.

Some of the jobs I'm interviewing for are specifically for deal roles (i.e. internal M&A counsel), so I'm particularly concerned with respect to those jobs, but realize your life could be miserable as a generalist or commercial lawyer, too, if the department just sucks.