There are way too many retail buyers to compete with to give any investor any room to work.  

If your job affords you the opportunity to do so at a faster pace than flipping then continue that course.  

Have you owned real estate before for investment commercial or retail??

Don't make the mistake of going with a national retailer who offers the option to pay by the month. 

If you replaced the mobile homes, maybe the homes could give you a return.I would research the cost of replacing the mobile homes with something lightly used (like cars, mobile homes lose 30% of their values the day the leave the retailer).  

Moving on to college with skilled labor, machinist, dirt construction, and retail sales.

You may decide that it is not a good idea, or the lending market may decide for you.If you have good long term financing in place and want to expand at a pace beyond what your cashflow will let you, consider private money/ JV partnering.

Therefore, if you know the area, what's a good retail price for these two homes: 323 Ashley Oaks Ln Lake Dallas701 Knollridge Dr Lewisville

Make sure they are motivated.Buyers - Find Wholesale, Retail, Owner Finance BuyersFinancing - Traditional, HML, Private IRA Lender, JV Cash Partner.COI - Center of Influence - People that can refer you sellers and buyers and lenders. 

Search Contract-For-Deed on BP, you'll see the issues, I'd  suggest you look up Subject-To as well, a better choice.It also helps if we define the type of "commercial" property we are talking about, multi-family is much different than office-warehouse or retail or industrial and each has unique requirements where having title may be more crucial in operations, such as regulatory compliance, zoning issues, construction matters and financing. :)