Its best to not have a slider if the trailer has the notched/rounded front corners that is designed for short bed trucks.
Now if the trailer is a older square corner very flat front profile like my old '97 5er then by all means your short bed Ram/Dodge will need a slider.
Don't be confused by GM owners claims of a slider not needed as the GM has a longer cab to axle dimension than the Ram/Dodge or Ford which gives more cab to front corner clearance.