[Festus2]

Welcome to the forum Herap. As an observation, I think your estimate of 500-600 lbs of "stuff" is on the low side. In addition to the "stuff" you put in your RV, you have to include the additional weight of all the "stuff" that you are going to add to your TV as well - weight of driver and passengers, hitch, and any other items that you might throw in the truck bed, such as a box, etc. When you are determining the weight of all your additional "stuff", don't forget to include the weight of full propane tanks, H/W tank, and any water you might carry along. In my opinion, you will end up with more than 600 lbs in your 5th wheel. You might be surprised at how much extra weight you end up with --- both in your TV and your 5th!
I would think that doubling your estimate would be closer to the amount.