So I think with the given budget your mom cannot afford to retire, especially given their low amount of savings, unless they are willing to downsize and move. That of course would mean the kids would need to find alternate living places, and Mom may want kids nearby more than retirement. I also think that they need to keep the life insurance given that without it, either parent will be in a very bad place in the event one passes.
I agree with Ysette, between the truck and car they're spending 1000 per month on gas, insurance, and maintenance. Have they gotten a quote on car insurance lately? I pay less than $100 per month for insurance on two vehicles, although I realize I'm in a completely different area. Also the maintenance seems like a LOT, maybe it would be worth it to get more reliable cars?
I didn't see a category for medical, do they have prescriptions/copays/eye doc/glasses/dental stuff that isn't covered?
And this is probably minor in the big scheme of things, but how many work outfits does your mom really need? Or does this category include haircare and beauty as well?
Do they actually use the timeshare, since there is a vacation category there too?
If you know the phone provider and how much data they use we can probably suggest cheaper alternatives for the cell phones.
I'm not gonna comment on the smoking thing except that the thought of $4800 going literally up in smoke every year makes me sick to my stomach.