There are 1 owner-reported suspension complaints for the 2021 Ram ProMasterin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Vehicle bottomed out and lodged on concrete entering driveway. Thor Scope Ram Promaster 1500 Chassis sits low and Thor installed Cummins Onan generator and 2 Trojan batteries under the chassis, that sit 2 or more inches below the rear axle against the Cummins install guidelines. The generator needs 6 to 8 inches for ventilation according to manual and RV mechanics. Both generator and batteries collocated together coming in contact with road debris, objects, water on roadways may cause critical failure of systems resulting in hazardous conditions (stalling, loss of control, fire, explosion) to drivers.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on May 4, 2026