Typically near the driver's station or in a cabinet or closet should be a listing of all the information you need. It includes tire size and tire pressures, Gross Vehicle Weight (GVW weight of fully loaded RV) and Gross Vehicle Weight Rating (GVWR) Gross Combination Weight Rating (GCWR), etc.
The GCWR is the maximum weight of the RV and a trailer or towed vehicle combined. Best thing to do is load RV as if ready for a trip and take it to a scale and get the real weight. The weight listed on the sticker often fails to take into account any options or additions to the RV over the years. Once you get the weight of the RV, subtract it from the GCWR and you will know your limit for a toad vehicle.