I struggled to understand exactly what you have, but I think -
Wife: 2 pre-marriage rentals, no further info
Husband: 1 pre-marriage house, worth $150,000 and needing repairs, subject to $185,000 option arm loan, wife paid off second mortgage of $40,000
Marital home owned jointly, subject to a mortgage (second mortgage paid off recently), worth $30,000 less than purchase price
Rental owned jointly, $55,000 equity, cash-flow $400 per month
Rental owned jointly, $40,000 equity, cash-flow $200 per month
You want to stay in the marital home and keep the first of the jointly owned rentals, husband wants to move into the second jointly owned rental. You are happy for husband to keep his pre-marriage house, and presumably expect to keep your two pre-marriage rentals. You want $1,100 per month child support. You are asking whether you should fight to also keep the second jointly owned rental, as you think you may be able to trace other assets your husband owns and the existence of which you presumably think would justify you keeping that rental under the rules of an equitable division State.
I would just say that if you get into the need to trace assets you are into serious litigation, quite possibly lasting for years, and serious legal and accountancy costs.
The other point that sticks out to me here is that you have a child of the marriage. It is in the best long-term interests of that child for it to maintain a relationship with both parents (unless one of those parents is abusive, of course) and for those parents to have an amicable relationship between themselves. Personally, I would put the value of your child's healthy and happy relationship with two parents above getting into a fight to keep all three of your jointly owned properties. My view on this is coloured by the fact that I heard yesterday that the son of a friend, with whom he lost touch after a bitter divorce, has just died of a drugs overdose aged 20. The long-ago fight over money which poisoned the relationship between that child's parents and led to my friend not seeing his son for the last 8 years is looking like a pretty poor choice at the moment.