==> Q. What does it mean by "facilitating"? Can we ask what kind of specific effort are they taking?
They may not even know. At this point they are probably trying to figure out what is possible and will do what they can, but are still exploring possibilities. You can ask what kind of specific efforts are being taken, but it will not make things move faster or better and may annoy those who are trying to help you. Sit tight and let them try. If you cannot restrain yourself, you can ask how things are going rather than asking what kind of specific efforts are being made, which is pushy.
==> Can I request my offer letter before my second visit? Can we walk away after the second visit if my husband doesn't like the department/offer?
Yes, you can request a letter, but then you are asking them to give you an offer knowing that you want a spousal hire before they have even interviewed your husband. I can't see why they would do that. Again, you will be seen as pushy.
Yes, you can walk away after the second visit if it doesn't seem a good match for you and your husband. You are not obligated to take the job.
==> Can I contact the schools I was interviewed and let them know my husband's possibility at the area and/or my possible offer at other institutions?
Yes, you should contact the schools to let them know that your husband is being considered at other schools in the area, so even if they cannot give you a spousal hire, you are still interested. They will be very relieved, and it will stress your interest in the position.
I just feel like they are not giving me full consideration because of slim chance i accept the position without my husband’s chance for hire.
Are you serious? They are giving you full consideration. However, fully considering you means generating a spousal hire and some schools cannot accommodate this. You cannot bring up the spousal hire, which in almost all cases is a extra work for the school, and then be annoyed that they are taking the spousal situation into consideration.
You have lots of schools interested, so you are doing very well, especially in this market. Plus your husband's CV is doing well. Enjoy your fortunate situation and avoid coming off as pushy as this can backfire.