Try it without and see how she handles. Make sure to get on the highway and do a few bridge transitions and have a few rigs pass you to get a real life indication of if it's needed or not.
My older bigger toy hauler I used a WDH but the new smaller one it's not needed. Have towed over 6,000 miles this year without one single issue in all kinds of weather on all kinds of roads including that pos 285 out of Carlsbad. That road could be used to check the weld integrity of hitches spring perches!
Anyway give it a shot without and make a choice afterwards.
