Welcome to JOF
It appears that your working with the UVW and/or dry weights published by Jayco, which can be a little misleading. The actual "Ship Weight" of the 154BH will be closer to 2,750lbs (approx., check yellow sticker on trailer). What also must be considered is the weight of the RV dealer added items (battery, misc.), adding at least another 50lbs......, figure approximately 2,800lbs off the dealer's lot.
The 154BH has a GVWR of 3,200lbs, which doesn't leave much of a CCC (3,200lbs - 2,800lbs = 400lbs CCC
). I believe towing the 154BH at it's 3,200lb
GVWR will be highly probable in most cases do to the limited CCC, so the recommended RV manufactures "loaded" tongue weight range should be 320lb to 480lb
depending on your personal loading habits (10% - 15% of loaded trailer weight of 3,200lbs). Maintaining a 10% to 15% loaded tongue weight of the loaded trailer weight will provide proper TV handling.
The published Tow Rating of any vehicle doesn't represent the "actual" tow rating, so in your case it will be less then 3,600lbs....., please note: http://www.jaycoowners.com/showthrea...uot-Tow-Rating
To reduce the weight guess work, take your Caravan under loaded conditions to a CAT scale and weigh it. Subtract the CAT scale weight from the Caravan's specified GVWR (identified on driver's door)...., the remaining weight is what you have for the trailer's loaded tongue weight and any other Caravan weight not accounted for at the CAT scale.
Once you weigh your loaded Caravan/154BH combination at a CAT scale you can confirm all your actual loaded weights.
Some of the smaller vehicles and OEM receiver hitches aren't designed for using WDH's..., so check your Caravan's owner's manual for any exclusions and/or WDH rating limits. Basically, if the loaded tongue weight of the trailer exceeds the "Weight Carrying" weight limit stamped on the OEM receiver, then a WDH is required as long as the loaded tongue weight doesn't exceed the "Weight Distribution" weight limit stamped on the OEM receiver.
Yes, the incorporation of a properly sized WDH and a sway control device would be recommended........, at least a sway control device like the one shown in the link you provided.
Hope this helps.