I agree with dh that the pros sound good for him as he's getting older
It would be easier on his body-no more icky crawlspaces and attics.
One lesson I am learning recently is that sometimes the extra money isn't worth it, no matter what, if you are in a job you don't like. Case in point: My husband is really, really looking forward to retiring from the military soon, and that scares the snot out of me--no job, only a pension and GI Bill bennies coming in. Yipes! But his body is worn out after 20 years in the service--bad back, four hernia repairs, three ankle surgeries, and one more ankle surgery impending after he gets back home from overseas. His body can't take any more hard labor, no matter how great the paycheck.
From your post, it sounds like your hubbie is in the same situation as mine--ready to move on to something easier on the body--the extra money from the current job isn't worth it. But, if the prospective job gives a guaranteed 40 hours per week, would that offset the lower paycheck? I mean, is hubbie currently getting 40 hours a week right now? If not, that may be something to consider.
I guess if he doesn't get called, then it's not meant to be.
From earlier posts in which you mention hubbie has filled in preaching for your church, I trust he is a man of faith and is putting it all into the Lord's Hands. If it's the Lord's Will for him to get this job, then He will provide for you and your family. (I'm preaching to myself here...I've got to remember this a lot more lately in my own life, too.)
Let us know how it goes, I'm excited to hear how it turns out. Given that jobs in your state are so few and far between, this would be a true blessing!