oldMan99
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I checked the TM ( http://www.liberatedmanuals.com/TM-9-2320-272-24-1.pdf ) and did not see it. (I don't think it is in there but I did take a look for it).
The bed is 20' so I am GUESSING/ESTIMATING that from behind the cab to the end of the frame rails is approximately the same. If I remember correctly there is a gap between the cab and the front of the bed and the bed overhangs the back of the frame rail by approximately the same amount. So, until somebody goes out and actually takes a tape and gets a real measurement, for sake of rough calculations say 20'.
Don't forget that there is already a fair amount of frame overhang on the rear of the M927 in stock form.
The M146 is either 275" (22.916' - Early model) or 286 13/16" (Figuer 287" = 23.916' - Late model) That means roughly 3 to 4 feet of trailer overhanging the end of the frame and don't forget, that frame is already several feet behind the aft tandem axle. Your rear overhang would likely be in the 8-10' (Maybe even as much as 11-12' !) range.
In my estimation, that is way to much. Unless you leave it more or less empty your going to be unloading a lot of weight (likely way to much) from the front axle and that could cause handling/braking issues, especially in any sort of emergency maneuver. Also, don't forget that when you have a rear overhang the "Back of the bus" swings WAY out in a right turn. Assuming you make a right turn from the right lane, at the apex of the turn the back left corner of your vehicle would not only completely block the left lane but would likely cross the "Centerline" into oncoming traffic as well.
If you really wanted to use the M146 you would really need to length the wheelbase in order to keep the rear overhang reasonable.
Just for reference; The big "Prevost" bus motor coaches are roughly the same length as a conventional "Greyhound" passenger bus. If you measure the wheelbase of these things (Center of front axle to the center between the tandem axles) you will get roughly 26 1/2'.
The wheelbase on the M927 is 215" (17.916') so if you consider the Prevost length the absolute maximum you do have roughly 8.5' that you can extend the frame.
Remember however, that to turn a Prevost takes a huge amount of space. And to make matters much worse, your M927 with the same wheel base will not turn nearly as well as a Prevost. Because of the mechanics involved in the front driving axle you can not turn the wheels nearly as sharply on the M927 as you can on that bus. (I looked in the TM for the stock turning radius of the M927 and could not find it. Not saying it is not in there, only that I could not locate it).
What you really need is a 20' shelter or insulated connex box (Just FYI a 20' insulated connex box weighs roughly 6,000 pounds empty.) There have been a few 20' shelters on GL lately. Most of them were missing doors but a decent fabricator can make new ones.
Just to give some perspective on the (Stock, un-modified) rear overhang issue I have attached 2 M927 pictures that demonstrate this issue very well.
Hope this A) Helps and B) Does not Hijack this cool M146 RV Conversion thread!
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, but when i put up the crown mold,base and trim around the ac it should tone it down some.
I could take a m146 or better yet a m 129 and convert it to a mobile shower,s---- and shave center with ,say 6 full bathroom setups and pull it to rallys,i know I would pay good money to spend a half hr or so in total luxurious comfort at the end of a long dusty day! It would sure beat having to use the portajohn and not taking a shower for 3 days! 
!
It saves liablitly lawsuits by injured fixture thieves.... 