We would like to change the vanity top in our master bathroom from a single bowl to a double bowl, but are not sure how to set up the drains for each sink as there is only one main drain. Could someone give me some pointers, please? Do we need to have a trap under each sink, or can the drain for the additional sink just be run over to tie in with the drain for the existing sink utilizing only one trap? We're not total plumbing dummies as we have replaced sinks, bathtub/shower combo, toilets, etc., but this is something new. Any assistance is appreciated.