What kind of jeep do you have? How modified is it? Trail recommendations will depend on your jeep, your confidence, and your stamina.
The only public park with electric that I can remember is Dead Horse Point State Park. difficult to get reservations though they have a site or two for walk ins and sometimes have cancellations (that is how we stayed there). With the private parks, they all looked pretty much the same. Check Passport America as some offer 1/2 price camping through PPA. If all sites are pretty equal, may as well pay less...
It is a beautiful place. 6-8 days will only leave you wanting more but that is a good thing, right? :)