[MarkEHansen]

I think there might be some cross-conversation here. For determining whether or not your truck can safely manage the trailer, the trailer dry weights mean nothing. If you have the trailer already, and can load it up and take it to the scales, then you can get the exact weight. Unfortunately, this isn't practical as a pre-purchase tool and doesn't account for the possibility of additional cargo (like waste water, etc.).

Best thing to use (as a reasonable estimate) is the gross vehicle weight rating for the trailer. You should check your numbers carefully, as a SRW 3500 may not be enough for this trailer.

As far as how much cargo you can put in your trailer, you need to be concerned with the GVWR as well. You can start with the dry weight if you must, but it's still not accurate. That is what the trailer weighed when it was completed on the factory floor and it will never weigh that again. It doesn't include, for example, propane tanks, batteries and other things I'm not thinking of.

Good luck in your decision.