You don't have to take the skid plate off.

Take a piece of cardboard box and cut it about 10-12 inches
long and about 5 inches wide.
Fold it in a U shape and make a channel out of it.
Slide it up under th drain spout and put a pan underneath
that is capable of holding 3 gallons or so.
Use the cardboard channel to direct the anit-freeze over
the skid plate and in to drain pan.

Been doing it this way for a long time.
the

1995 Trooper LS auto 3.2 DOHC /w SOHC intake
1989 Trooper 2.6 auto
1989 I-Mark RS DOHC 1.6
1991 Stylus XS DOHC 1.8