Could have all three rentals paid off in 3yrs should I?

[Marquis W.]

I am a firefighter and started a second full-time job with purpose of increasing income so that I can buy more property, reduce current toxic debt(any debt that doesn't pay for itself) and paying off the 3 rentals that I currently have so that I can take and borrow on them again to buy more rentals. Was wondering if this is the best route to go or would it be better to use extra money to give me and my wife's ira and 401k a big boost. I am only going to do this 2nd job for 3 years and I know the first year is going to consist of getting out of the toxic debt so that leaves 2 years of either paying off rentals or investing heavily into ira and 401k...