The 181 table has been cussed and discussed on this forum for quite some time. We bought ours in December of 2010, and it had the two-legged table. There is a gap (6" or so) between the table and the wall when it is set up. Some owners didn't like that, so Heartland went to the clips. They got rid of the gap and one leg under the table. Then owners ran into the problem you have, so the factory is sending the second let to those who request it. Someone there is probably complaining that "You just can't win!"
My suggestion would involve a redesign of the whole area. I'd mount an L-bracket on the rear wall with a small shelf attached, just the width of the gap, with the bottom of the bracket sticking out an inch or so beyond the shelf. When the table is up (being used as a table) the rear end would rest on the bracket and the front end would be supported by the single folding leg. For safety a couple of pins could drop through holes in the table and the bracket. When the table is down (used as a bed) it would be supported by the existing rails (leg folded). The shelf could be used for a tissue box, glasses, etc.