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The latter...... M989A1 (TRAILER, AMMUNITION, HEAVY EXPANDED MOBILITY, 11 TON,, NSN 2330-01-275-7474
Yes. M989 and M989A1 are two different beasts.
Equipment data/dimensions for each can be found in TM 9-2330-368-14&P and TM 9-2330-383-14&P, respectively.