No security deposit.

[Ruel K.]

I am renting out my unfurnished 2BR / 2 BA townhouse for $2k/month. Security deposit is $3,500 + first and last month's rent are the move-in costs, bringing it to $7,500. Right now I got 2 prospective tenants, both women. One has bad credit, 9 months at her job and gets paid $7,400/month. She is a regional manager and travels a lot. She has good referral letter from her current apartment manager. The other lady is her long-time friend and roommate. She has been 6 years at her job and says is never home. Due to one of  them having bad credit/low credit score, I would double the security deposit. They can only afford the first and last month's rent of $4k. They seem to be nice and really decent people and have promised to take good care of my property. What do you guys think of no security deposit? Kinda risky right? Should they at least make the minimum deposit of $3.500?