That depends on the construction. First of all, I would dry the pegs (you could do it overnight in the oven at around 200 degrees & leave the oven door cracked open). That way, they'll tighten. The boards shrink very little lengthwise, so no worries there. Width and thickness will be your biggest problems, and you may have issues with cupping, as well. My recommendation would be one peg in the center of each table top board to allow it to "float" as it dries. Another trick is to slot the peg and put in wedges (both ends). If you have a blind hole, you will drive the wedge into the peg as you drive the peg against the bottom of the hole. When the peg is in place, drive a wedge in the top slot. If the peg comes loose, just drive in a thicker wedge. Hope this all makes sense.