It sounds that you have moved too much weight to the rear of the van - you say you have emptied the front water tank etc - sway is usually too much weight to the rear of the van. Too much weight at the front will not cause sway but may cause other issues.
The simple rule of about 10% of the weight of the van on the tow ball is relevant = personally I would go about 8% and not over 10%.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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