I have a 1993 Dodge Caravan Se 3.3 V-6 4-Speed Automatic

The sliding side door or what some people would call a third door...Has a crease dent the size of a volley ball in it...Last night i tried to use one of those pull-a- dent tools on it...Without much luck in removing it...I have searched and have read many articles on body work and have even restored a few cars in my life time... Restored a 1964 Ford Thunderbird(Big Bird) and a 1993 Gmc Sierra...But have never dealt with many crease dents...I know there are all kinds of tools...That we can buy...But was wondering if anyone has any advice on crease dents and how to fix them or anyone who has fixed them in the past on rides they have owned ?...Thanks

Also wondering...Before removing the inside third door panel...On this kinda van...Is the inner part of the door solid or hollow?..Can the dents be pushed out from within the door ?...Thanks