estimated cost to replace rear brake lines (requires dropping the fuel tank)

What is your question?

2006 Dodge Caravan, need to replace the rear brake lines (rusted out and leaking like siv). This will require dropping the fuel tank. There is a lot of rust on the underbelly (i.e. the reason for the brake line(s) failure. Please estimate the labor cost to this problem. I have found that the parts are fairly reasonable, especially if sourced from partsgeek.com. So the big cost is the labor and the big question is how rusty is toooo rusty to drop a fuel tank (straps, bolts, etc) and then put it back in place (is there any chance it wouldn't go back together??).

How long has your 2006 Dodge Caravan had this problem?

two tweeks. vehicle is unsafe to drive