You can see by the pics how I have achieved approximately the same wheelbase as the ride on, yes, centre to centre, as per my sketch.
The forward of the two vertical pivots is for left and right arc's, (I placed it here to retain the same track when cornering as it was previous), the rear of the two vertical pivots allows for about 5 deg radial movement in each direction from centre.
As far as a support for when it is seperated, a simple landing leg is all it needs. Once I have achieved a more succesful tow / hitch arrangement than my original design (I still prefer it actually), I can then locate a landing leg in a place that will not interfere with any of the slasher's operation. Electrical controls, utilising the ride on battery, not it's own battery (as I suggested earlier), can well be an option and not standard equipment. It would take nothing to wire it up, even with a 100 amp plug for the starter cable. I've used it quite a lot without electric controls, and without hassle.
I don't believe that the way I have the towing boom tow points, and the centre tow point to be an issue. Either in the previous design, or this one. It simply doesn't take much to get off and manhandle to a diferent position.
Bear in mind also, one of my aims is to make this able to be towed on either the right or left side. This is why I've designed the latter version the way I have. I know the pics don't show it, but it works exactly the same on the right hand side.