The 1,400lb rated spring bars should be ok.................,
Once you have your TV/TT under loaded conditions head to your local CAT scale. To dial-in your WDH adjustments the CAT scale will tell you everything you need to know. Also, the CAT results will confirm that your actual loaded tongue weight is within the limits of the WDH (or if cargo relocation needs to be considered).
CAT scale how-to: https://www.jaycoowners.com/forums/f3...v-tt-3871.html
JOF member "javelinman" scaled (via Sherline tongue scale) his 2015 338RETS loaded tongue weight at 1,600lbs, but we all have different loading habits: Post #21 in the following thread:
Jayco's published (web site, brochure, etc.) weight specifications for the 2014 Eagle 338RETS are:
UVW..... 8,590lbs (actual ship UVW will be higher, refer to sticker on TT)
Dry Hitch Weight...... 1,140lbs (only gets heavier from here)
Even with 1,500lb rated spring bars I would still recommend a CAT scale visit because the 338RETS's tongue weight can climb fast. If you normally travel with some water in your fresh water tank, insure you have water in your tank prior to the CAT scale visit.