@Aspen03 For the alternator, if your Expy is 05+, meaning a 3V engine, look at the 09-10 Mustang GT alternators, they are a direct swap for ours, and are 3 phase 150A instead of single phase 110-120A, it needs to be for an 09-10, not an 05-08 which are single phase and identical to what we already have. Its a easy way to get a more reliable, more powerful alt while staying with something ford and durable. I have a 07 Mustang GT and this is a popular swap for those cars also. The only difference in them exterior wise is the harness connector is rotated slightly but still fits perfectly.
As for accessories besides all the lights i mentioned which are LED so not a huge power draw, because we use the vehicle for road trips, i installed dual usb chargers in the third row, not power ports but the actual 3A dual usb with volt meter all in one units so the third row gets 4 usb charge ports, plus the actual power port which is right behind the third row.
I also put 3A USB insert chargers into the second row power ports so they can still pull them out to use the actual power port if needed.
In the front i have an actual Android 8 Head Unit, double din, with integrated 4G LTE connection so the truck also provides wifi to occupants like some new cars do, as well as that 4G also providing data to the head unit so i can stream whatever i want, or do google maps, or even make phone calls.