We've got 4 active on the 09. Bought two online from discount dealer to add to the two originals, programmed by manual. One problem. The locksmith who cut the metal keys messed one up (normally this shop gets everything right the first time). It took him two months and $30 to get a replacement blank when he had charged us only $5 to cut the keys. I suspect the the trainee who cut the keys has had some more intensive training since then. This shop also has bought the equipment to program the new remotes to car if you don't have two - cost about $15 grand apparently, but does most brands. They'll be charging a hefty fee for that programming, but a little less than dealer.
'87 Caravan LE 3.0, '91, '92, '93, '94 Grand Caravan LE 3.3
'02, '09 T&C Limited 3.8, 4.0