somethign I have done, that works well for catching multiple whites at a time and is simpler and cheaper than an umbrella rig, is to tie three swimbaits (curly tail grubs or cocahoe minnows are my faves) on jigheads about a foot and half or so apart from each other on your main line, in a sort of a daisy chain. troll this rig, and if you pass through a school of whites and/or hybrids every swim bait is likely to get bit. I have even caught a white, hybrid, and lmb all three at same time once. I guess they were all feeding on the same school of shad or something.
doubles and triples are common with this rig...but recommend using a fairly heavy leader, like 20lb or more, as the sharp gill plates can cut the line when multiple fish are hooked.
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SCOTT