Though I have no welding equipment, a friend I work with has a home metel shop. He has agreed to assist me in my mobile base for my jointer. I'll try to describe my ideas. We work construction, and 3" angle scraps are discarded everywhere.
Make a frame just big enough for the jointer to sit in, with the angle going up the outside the perimeter, and under the machine. Drill wholes where the feet are in the corners, and bolt it to the frame.
Next take 3" long pieces of the angle and weld them on the corner with the L outwards, on the long side (front and back), but raise them so casters are about 1/2" lower than the framework. Drill and mount the casters.
Next take some solid round stock (out riggers) and weld it at a 10 degree angle reinforcing the caster angle mounts and weld on a 2" square, 1/4" thick pad at a 10 degree angle so it sits just under 1/2" above the caster.
If the machine tips, the pads will stop it at 10 degrees, and return to the casters. This design will not raise the heigth of the machine unless you want to. It can be painted the same color as the machine (previous posted a paint code to match Ridgid Gray) so it will look 1/2 way decent. And the 3"x1/4" thick angle will add some weight to the bottom end for better balance.
I've considered making the out riggers from hollow tubing, and welding a nut at top and bottom and using threaded rod with a star handle at the top to turn down the pads for stationary use. Haven't figured out how to make the pads pivot since the out riggers are at a 10 degree angle. Maybe use cheep HF C Clamps and cut away clamping part of the frame on the clamp and weld the pad on the swivel end of the threaded rod.
The casters and out riggers will be somewhat cumbersome to work around and take some getting use to so your not tripping over them on longer boards. But if mobility is a neccessity, I can't think of anything else that would be better short of mounting it to a frame and moving it around with a dolly. And that would surely play havoc with the table alignments. Have to keep that base solidly mounted or the top end will receive twisting torque.
John E. Adams<br /><a href=\"http://www.woodys-workshop.com\" target=\"_blank\">www.woodys-workshop.com</a>