Deborah,
You have a vehicle for which it is difficult for anyone to come up with a obvious yes or no answer. Towing RV'ers usually err well on the side of caution (a good thing) and some won't consider anything less than a V8 with 6000+ lb tow rating for towing even a Trailmanor.
Having said that, it is quite possible to keep within the numbers if you load lightly and there are many quite happily towing smaller (and some even mid-size) Trailmanors around with V6 SUVs and minivans with 3500lb tow ratings. Just yesterday I read a report on another forum about someone's successful maiden trip from San Francisco to Colorado Springs towing a 2720SL with a Toyota Highlander.
You have the following advantages:
- The trailmanor is low profile without the high wind resistance and instabilities inherent in full-height travel trailers. If you assume that TV manufacturers' ratings and typical towing rules of thumb are based on the full-height trailers this is a definite advantage.
- At 120 inches the Freestar has a much longer wheelbase compared to the typical V6 SUV or minivan. This is a highly regarded attribute for towing stability and safety.
- With luck you have the larger engine with 263lb ft torque. That's not a bad figure and will help on the inclines.
Also, see this link:
http://www.rvlifemag.com/file343/hitchhints343.html
If you have the Ford tow package it is probably just a class II hitch receiver. You would be best swapping this out for a class III receiver. For a minivan suspension you will almost definitely need a WDH (weight distribution hitch) to relieve the hitch of some of the tongue weight and to get more weight on the van's front wheels (however, I don't know the recommendations for using a WDH with this van). You will also need a good brake controller fitted to the van.
The Hi-Lo is typically much heavier than an equivalent TM and the towing with a Freestar question becomes moot.
In the end, the decision is up to you and will depend on your usage of the TM and your comfort level. You should read the past posts concerning smaller TVs the Towing Rigs section of this forum and you might also see if there is Ford Freestar forum where towing is discussed.
Hope this helps
-Paul