I'd take a step back and hit some scales and do some weighing. Anything you do at this point is guessing until you get some knowledge and can make an educated decision.
You need to find either a CAT Scale
or local scale (quarry, dump, farmer, etc.) that you can get some weights. Specifically, you need to find out:
a) What does your truck and camper weigh with the weight distributing system hooked up (i.e. spring bars attached)
b) What does your truck and camper weigh without the weight distributing system hooked up (throw the bars into the back of your truck)
c) What does the truck alone weigh
In each case, you want to get individual axle weights - the "steer" axle on the truck (the front one); the "drive" axle on the truck (the rear tires) and then the camper's axle (obviously not in #3 because you've left the camper parked in a parking spot).
The CAT Scales are typically around $10 for the first weighing and then $1-2 for each re-weigh within 24-hours.
From these numbers, we can calculate your tongue weight and total weight for the camper.
You want to make sure the truck and camper are loaded up like you normally camp. Make sure everyone stays in their seats, etc. If you're going to an actual CAT scale - keep in mind that they're setup for big rigs and reaching the call button can be a challenge. There are 2 great suggestions for this: a) carry a 3' broom handle to push it or b) go inside before you weigh and get a phone number for the scale desk + call them from your cell from the scales.
Your goal is achieving 10-15% tongue weight for the total camper weight. As well, you want to make sure the hitch is dialed in and is pushing sufficient weight back to the front axles (dealerships generally fail you here- even though it looks like they know what they're doing).
And finally, a major deviation from above - what type of tires are on your Ram (size, type, brand/model)?