The 198RD has a GVWR of 5,900lbs, so based on the manufacturer's recommendation of a loaded tongue weight of 10% to 15% of the loaded trailer weight....., towing at the 198RD's GVWR this would be 590lbs to 885lbs tongue weight. A loaded trailer weight of 4,700lbs would be 470lbs to 705lbs loaded tongue weight range...., etc..
The WDH rated at 600lbs would be fine as long as your personal trailer loading habits don't exceed a 600lb loaded tongue weight.
2016 GM 2500HD 6.0L/4.10
2005 Jayco Eagle 278FBS
Reese HP Dual Cam
Putnam Class V