If using curl tails on your jigs, put a 3 to 4 foot leader on each and tie onto a common swivel at the end of your line. Now, when putting on the grubs, the curl tails, face one left and one right....if the jigs aren't too heavy, they will pull apart on the troll.
Another way is to tie one on the end of the line, then two feet up the line tie in a loop knot and then tie a slightly heavier jig onto the loop. This is easy to do if you sand the underside of the first jighead, making it lighter and angling it up in the front as you sand so it will ski up a bit.