You can do a search on Ebay, there's a couple RV parts dealers selling the Rieco add-on kits. They're great kits, but not cheap. One reputable dealer is selling the whole kit for $1238.00.
If you use a drill, you'll 3-leg your camper a lot. For your pop-up that's not so bad, on a larger one like mine it's very bad. The jacks aren't rated to handle 3-legging mine, not to mention it feels like it's going to tip over.
The Rieco kit eliminates that with an "ALL-UP" and an "ALL-DOWN" button. Takes all jacks and raises/lowers it all at once. Makes it much faster and safer than doing one jack at a time.
Rieco motors draw 25 amps per motor. Use 8ga wire per jack, and 4ga going from the controller to the batteries.
Make sure to use m