rider1520, I have thought about your response a bit before responding to you again. I will apologize in advance if what I post now is "old news", but I want to make sure we are talking about the same thing. You responded, "both Jayco and Winnie have the same weight rating". If your are speaking of Gross Vehicle Weight Ratings, then you are correct. All relatively new Ford E450s come from the factory with the same GVWR. However, the house boxes that the various manufacturers build on the chassis are usually different weights. Thus, the amount of weight you can safely carry, the Occupant and Cargo Carrying Capacity OCCC ratings usually are different. Besides the house box, other factors that decrease your OCCC are length (mostly a longer Class C weighs more, thus the OCCC is decreased compared to a shorter rig), options like slideouts and automatic leveling systems. If you plan to travel long distances or need to carry a lot of stuff (food, clothes, family, toys), a rig with a higher OCCC is more desirable. Do not expect a sales rep to provide accurate info on this. In new rigs, a label with the OCCC info is inside the rig, usually in a drawer or cabinet door.
You also noted, "... a Class A obviously that can carry more." A little caution here is recommended. Don't confuse space (volume) and weight. My DW and I went to the Hershey RV shows a few times before we selected our rig. This is true, I saw it with my own eyes, we were in small Class A gassers that would have been overweight with our four adult family members on board alone, without stuff. No, we are not "big people". Don't be fooled by space alone. Check the OCCC. Again, pardon me if this is stuff you know, I just couldn't tell from your response.
Good Luck on your decision.