Not sure about best but I run this
https://www.eaz-lift.com/products/el...t-600-lb-kit-1
Have had it on 3 different trailers (28', 34' and now 23') works great. But always on RAMs. Pulling a 30' trailer with a JGC does not sound fun.
EDIT: If you use this system get the spring bars that match your weight.