My 501a Ecoboost did not come with the pro power generator, but instead came with a single 400w outlet. I am a little bummed, but it is what it is. Can I still get one put in after the fact? Would you say if I were to order the part(s) it is a difficult install? Does anyone have the part number?

 

I looked into it, as I have an 8 foot bed, which excludes getting the factory inverter.

You're going to end up spending around $3-4k or more on parts. You need the second alternator, the inverter, the dual underseat batteries, a couple other random modules, some wiring harnesses, the 120V bulkhead, and some assorted wiring. If you don't DIY it all, you're going to add at least $1k in labor to that.

It would be much more cost effective to install an aftermarket inverter and alternator system. You could go with any power you want up to about 8,500 watts, though above 3kW the price is going to rise steeply. It is still much more expensive than running a small generator, both in equipment and in fuel costs.