To limit the length of a rig in a site, you can use the "max rig length" attribute (Site Details, click More Site Attributes). If you don't see it, then you need to enable that field in the Data Field Definitions. Once those are set up, and assuming you have "Use Preferences" checked when you make a new reservation, it won't show sites they don't fit on.
There isn't a specific way to restrict what type(s) of rigs go in a site. You could possibly use different Site Types for them, but it wouldn't restrict them automatically.
Stan Spielbusch
[Forum Administrator]