tongue jack...uh...foot?

also, do we have a 2 inch or 1 3/4 inch size?

I have a round foot that slips under the jack when in use. I toss it in the back of the truck when underway. I found it in a clearance bin at the local RV store, no packaging, I think it cost me $2. Even new, they're pretty inexpensive.

I just use a 8" long piece of 2x6 under my tongue jack.  I've got a couple of them and also use them under the stabilizers when the ground is soft/sandy.

  I made a foot for our POD. It is about 6 inches x 6 inches square. I just use some old flat steel, about 3/32nds of an inch thick cut to 6x9 inches, rolled the front and back ends over a piece of 1/2 inch rod for support. Then welded a couple of pieces of 3/4 inch angle that I cut about 4 inches long to 2 pieces of 1/8 inch thick metal that I cut to 3 inches x4 inches high. The angle was welded to the 3x4 pieces with the 3 inch side centered to one side of the angle iron. These 2 halves were then clamped together with the foot of the angle iron facing out and I drilled 2 holes in them. These holes I centered and started at 1 inch down from the top and the other about 2 inches below that. I believe that I used a 7/16th inch drill bit, so that a 3/8 inch bolt would easily slide through the holes. I then welded these uprights to the base plate with the angle running from on rolled up end to the other with an extra 1/4 inch over the width of the jack tube. The holes in the jack tube I believe are 3/8 of an inch. 

 We have a 2009 171 and the outside diameter of the jack tube is 1 7/8 inches. I don't think the jacks changed with the newer models.      David