Chris brings up a good point.
Just to add..... if that F250 has the heavy service package from Ford its the same as a F350 SRW in load load carrying ability.
Just about all 250 and 350 SRW trucks can have the same tow rating as they all have the same engine/tranny and front and rear axles.
AS was mentioned the difference is in the trucks rear spring packs and possible higher rated tires and wheels....unless of course the 250 has the HS package.
If your going to full time I would recommend a late model one ton SRW or DRW truck unless your capable of fixing old worn out trucks on the road. Just be aware of Fords 6.0 and 6.4 engine issues in later years.