I have a M934 Expansible with the NHC250 Cummins. Needing to get this rig moved 90 miles YESTERDAY, my 2 x Hawkers chose the worst time to let me down. On this site, one member stated that he's had great luck with using 2 x Interstate MTP65 batteries in several of his trucks. I've located 2 in a store in town and am ready to buy them, but wanted to be sure that they'll fit under the seat since they are 12" long and my Hawkers are 11". Any experience with fitment or any other comments are welcome. Thank you!