Sounds like you have the "325" manual system. It's a very good system, just not automatic. Probably was a money saving issue for the SE model. The 325 was the standard system for Journeys until some time in '04. Mine is an early '04 and has the 325 system. I have seen later built '04s that have the 625 (auto) system or maybe it was an option in '04.
Your HWH manual should have the leveling procedure. If you didn't get the manual, call or visit the
HWH website and download a copy. The basics are to level side-to-side first, then front-to-back. If any jacks are still retracted after you've leveled, use the appropriate front-to-back leveling button to extend that jack for stability.