Those are good prices,especially if in good condition. Condition is EVERYTHING!
I have one with a removeable tower, all new tires, and a camo tarp over the tower.
Very unique and in excellent condition and I would not take less than $2500, so that will give you an idea of the extreme price range based on condition and amenities.
Also, the M106 as a 5 ton is the perfect fit for the box on back of a M109/185 if you wanted to make a coversion camper on a trailer, rather than carrying on a deuce. Both are 14'X8' and the M1061 will hold 10,000 pounds where the M109 box is about 3800 pounds empty.
If I don't sell mine, I'm thinking of making the conversion trailer camper, freeing up the M35A2 carrier deuce and only dragging along the box when it is desired.
OH, here's a pic of what you can do if you come up with the removeable tower. It has a FMTV cover on it which is not a perfect fit, nor is it tucked up and in there quite right yet, but it will do for a quick throw on. Also, not sure about yours, but with the square tube landing legs on all four sides, you can pick up the entire trailer off the tires and change out a tire if you wish. Good luck!