Can QCAD assist me in designing a layout for an RV or mobile home park? I need to layout lots and roads and common areas, etc.
Hi, and welcome to the QCAD forum.
If that can be considered as in 2D then yes.
‘Assist’ is a large word, QCAD is a design tool to draw geometrical things and present them on paper or PDF.
It is versatile in use and does not have a specific module for e.g. plot designing.
At least you need to get acquainted with the CAD package and its functionality. 
Regards,
CVH
Thank you for the feedback!