You shouldn't need a WD hitch setup for that trailer, but it wouldn't hurt.
That said, if you do go WD, I've been very happy with this 6K Fastway I used for my boat (3800#) behind my fiver. Mostly just for the sway control, so I had it loaded about as light as I could just to get friction on the bars for sway control and it helped with sway and the vertical snake.
https://www.etrailer.com/Weight-Dist...2-00-0600.html
It's a near knock-off of the Equal-i-zer, but the bars are way easier to remove.
I got lucky and found one on CL for $75 when I was looking.
DON'T buy anything with chains, ugh, and they're not surge brake compatible.
What's the tongue weight?
What did you have loaded in the Burb?
Do you have oversize, spongey tires?
Did you run the tire pressure up some for towing?