We had some issues last time travelling with 4 adults, 3 suitcases (~23kg). It was OK at the airport as they had airport trains and airport buses that catered for suitcases. The airport train also had a complimentary minivan service that delivered us to the hotel.
When we took the train from Mainland China to HKG, there wasn't the facilities available. Nor when we took the train into Guangzhou, China. We lined up at the taxi stand but they wouldn't take us - not sure if the distance we were going to wasn't that worthwhile for them or if we had too much stuff. We basically walked around and managed to get a ride with a uber type vehicle.
Anyone with experience like this? Organise with the hotel to pick us up? Just use airports in future? Are there luggage transportation / delivery service China / HKG or most places generally?
Edit - we thought about local subways MRT/MTR but with luggage thought it would been unwise.