Hello, I am hoping to get some opinions on this.

I work with a manufactured home dealer, they have four separate companies that work together:
1) mfg home retailer (does the deal for the mfg home)
2) development company (purchases lots and develops them to be ready to accept new mfg homes)
3) real estate office (sells the package, land+home)
4) mfg home service (mfg home service work and installation/setup)

They currently have 4 different domain names and websites, one for each, very poorly made sites as well.

I have been setting up a database for the companies as a whole, and have completed database interface for them to use, the next step is creating the front end websites.

My thinking on this so far leans toward having all four domains point to one website that explains the relationship of the four companies, their roles in the process, etc.

My goal is to not confuse visitors, and I currently believe that four websites with independent identities/looks might cause visitors to question weather they are at the right 'place' to get the information/help they are looking for.

I would like to know what your thoughts are on this subject as web users and developers.

Thank you.