Karl Townsend wrote:

You're reinventing the wheel. Just make the generator, pump, compressor,
etc. Cat 1 3 point hitch attachments. Make your power unit with a Cat 1
3 point hitch type output. All the components are readily available and
inexpensive, Cat 1 pins, 1-3/8 6 spline shafts, couplings, overrun
clutches, etc. You power skid is just fine, but use a standard output
method so it is flexible. You power skid can power any Cat 1 3pt
implement, and your generator, pump and compressor can readily be
powered by any Cat 1 tractor.

probably a good idea but I can make it smaller and more portable with the
mold plate type concept. tractors are the wrong RPM so there's no need to
fit a three point.

Karl

The Cat 1 3pt will add about 18" to the length, pretty negligible. As
for the RPM, my Cat 1 tractor (Kubota B7100DT) has 540, 1000 and 1500
RPM PTO speeds.