Dodge didn't make reg cab trucks with 6' beds, so it's likely that you can only run a 8' bed.
As far as mounting the bed, it likely doesn't have the right ones for a regular bed, but you can weld some on fairly easily. Get a picture of how the front of the bed is mounted and I'll be able to tell you for sure.
All you got to do on the front is get rid of the adapters like you said.
On a normal dually, the rear is 1.5" wider then SRW. No adapters to take off so if you don't like you've got to change the axle. On a Cab and Chassis dually, then I'm pretty sure the axle is narrower (recently sold my C&C so can't get you any measurments). To know if it's a C&C, check the Vin number if the 7th digit is a 6, it's C&C. How to read the vehicle identification number VIN on your Ram truck
As far as mounting the bed, it likely doesn't have the right ones for a regular bed, but you can weld some on fairly easily. Get a picture of how the front of the bed is mounted and I'll be able to tell you for sure.
All you got to do on the front is get rid of the adapters like you said.
On a normal dually, the rear is 1.5" wider then SRW. No adapters to take off so if you don't like you've got to change the axle. On a Cab and Chassis dually, then I'm pretty sure the axle is narrower (recently sold my C&C so can't get you any measurments). To know if it's a C&C, check the Vin number if the 7th digit is a 6, it's C&C. How to read the vehicle identification number VIN on your Ram truck