I don't want to give the links just because this is for a proposal, but yes, they have the same keywords.

It's almost like the three domains are market based. Dallasredcars.com, ftworthredcars.com, and austinredcars.com, so regional for the same products.

I need some help figuring out if I should combine multiple domains or if I should let them be separate?

I have domain1.com, domain2.com, and domain3.com. Well, domain1.com owns domain2.com and domain3.com. And currently domain1.com points to domain2.com and domain3.com from the homepage. They are going through some changes at their business, and now the option is on the table to combine the domains or still let them be separate as long as they link to each other.

What is the best way to handle this and are there more things I should go through before making a decision? None of them have a ton of links to them, and they aren't super robust, but would just to have some advice.

Thanks a lot