The Manfrotto 498RC2 has a maximum load capacity of 8 kg (17.64 lbs), making it suitable for DSLRs with telephoto lenses.
Yes, it features the RC2 system and typically includes one 200PL-14 quick release plate with a 1/4"-20 screw.
Yes, it features a dedicated 360-degree panoramic scale and a separate pan lock for controlled horizontal rotation.
The base of the 498RC2 uses a standard 3/8"-16 female thread, compatible with most professional tripod legs.