Any farm table can be built in with additional 12 inch extensions on each end. They simply slide in and out and screw down tight from underneath. And yes they are stable and no you can’t break one off by leaning on it. Simply store elsewhere when not in use. The additional two feet allows another person to sit on each side. So sometimes this comes in real handy! This price is for poplar tables. But you can get these on any type of top. Just call for pricing on other woods. The 1795.00 is for any length of farm table up to 8ft and 2-1ft extensions. If the table is longer than 8ft it is a 100.00 more per foot.