i would get amtrans re or thomas re safety liner if school bus, with auto trans as my thomas got 10+ mpg. a transit with the right engine n trans is aelso to consider, n air ride is nice. first diesel i had was 6v71 transit, followed by flxible 8v71 transit which was great but only 8 mpg...the older mrci, prevost, et all, need careful suspension check as the coach bus travels in harsh winter conditions. of these coach, i prefer the setra, but parts r not cheap. i have found cheaper amtrans n thomas in washington, n also in the smaller places in northern cal.
Jesus Christ... Conversion in progress.