Reply by Loren

Larger capacity radial arm saws certainly exist but you might
consider building a crosscut sled for a table saw or even a
jig for a handheld circular saw if you just want to get the
woodworking done without chasing down an old machine
and dealing with whatever issues it may have.

If you want a larger radial arm saw it may take awhile to find
one and even then you may have to deal with a 3 phase motor.