Thanks for your responses. I wouldn't rely on the buses' hydraulic brakes but it does have a parking brake on the drive line that will do a little braking.
I attached some pictures which shows that there is a front bumper support issue complication. In one picture, one of the curved supports was broken off on the left side. (The bumper which is not a real heavy duty one for the weight of the bus is bent on the top and bottom.)
Because my move requires going down a small hill that's not too steep though, the bus is going to push against the towing vehicle and tend to mash the left side into the front of the bus, of course even if we use some old tires as a cushion. All there is directly behind the bumper is thin sheet metal basically so I need to resolve this issue somehow.
Also, in order to get it into a field, it's going to be sort of tight quarters to maneuver it which will help make the move challenging to miss things
. Another thing is connecting the towing vehicle to the bus in order to have some slack to turn but not too much. Yes, I suppose a tow strap would work good if we can figure out how to connect it up but with some slack but then again, the bus bumper support is an issue.
Another concern of mine is pulling it up a small not very steep (luckily) grade that has natural vegetation on it after we get it off the road and the 3/4 or 1 ton 4WD truck's wheels might spin. (The bus has, I suppose a ton of stuff inside which won't help.) I do have a 45 HP 4WD tractor--a NH TC45D with a loader (adds weight) but the bus easily out weighs it. I see that it was suggested to add some weight to the towing vehicle which is a good idea and to take it real slow.
Hope to hear some more from you as for suggestions.