First, welcome to JOF
Smart move on taking the time to determine the towing capability of your Dodge Ram prior to making your TT purchase. The following represents some food-for-thought that may help you in establishing a TT short list:
* Your Ram's "actual" Tow Rating is lower then it's published Tow Rating of 8,400lbs, because the combined weights of the TV's passengers, options, cargo, etc., have yet to be subtracted: http://www.jaycoowners.com/showthrea...uot-Tow-Rating
* As mentioned, the loaded weight of the TT gets subtracted from the payload capacity of your Dodge Ram.
* I also concur with member "Raugustin's" suggestion of weighing your loaded Ram at a CAT scale, eliminates a lot of the guess work. Knowing how much payload you have remaining for TT's loaded tongue weight can real quickly narrow down the selection process.
* Be careful when referencing published UVW and DRY weights, think in terms of potential "loaded weights". If you can, look for the yellow sticker on the side of any new TT and it will provide the actual "Ship Weight", which is a realistic starting point to start adding the combined weights of RV dealer installed items (battery, WDH, etc.) and your personal cargo. If you tend to tow with fresh water in your tank, don't forget to account for this weight as well.
We all have different loading habits, so what might be a weight deal breaker for one may be ok for another, but the important thing is to remember that cargo weight adds up fast.
Although the Jayflight 28BHBE has the biggest CCC (and GVWR), it will however have a higher base "ship weight" by at least 1,100lbs, and when moderately loaded may have the highest potential of exceeding one or more of the Ram's specified weight limits.
The Jayco Whitehawk 28DSBH & Jayflight Swift 267BHS IMO would be a better choice. Using the Swift 267BHS as an example, here is one loaded TT weight scenario:
(UVW 5,315lbs) + (Ship Weight delta of 300lbs) + (Dealership Battery, WDH, etc., 125lbs) + (Cargo 700lbs (no fluids)) = 6,440lbs.. At an average of 13% for the desired loaded tongue weight = 837lbs.
A WDH rating of 1,000lbs would be a minimum recommendation, but a 1,200lb rated WDH would better if you tend to pack heavy and/or carry water in the fresh water tank.
Probably a little more information than you wanted, but I wanted to provide you with a little insight into my thinking behind my responses to your questions.