Apparently, a shipload of M105A2 beds is being sold at Rock Island base, in sets of three each. I have a feeling that they are new old stock. I also have a feeling that the military is dumping all M105A2a and probably all M35A2 trucks also.
And if I was single, I would for sure buy an M35A2 or A3.
Anyway, I made my own trailer out of a bed like this 3 years ago and I have been very happy with it.
Rock Island may be close to RogerN.
A word of warning, since such a huge quantity is being auctioned, selling off the unused beds may be difficult if the market gets flooded with them.