As mentioned in your other post, yes, that would work just fine. The Corolla has a towing capacity of 1500 lbs (I just checked on
www.toyota.com). Most jet skiis (the stand up type, not the sit-on type) weigh about 500-700lbs. Add 100 lbs for the trailer, and you're well within the limit.
I-95 is probably pretty level and close to sea level. You should have no problem. That Corolla 1.8 has more power output than the engine in my 4wd.