Welcome to the IRV2 forums.
I have an '05 36TK3 also--will be happy to help you with any questions about it that come to you.
Unless the original owner bought it with the Magnum suspension, you have a 16000lb GVWR and 16" wheels. Look in the cabinet above the stove--there should be a label listing the Gross weight and the shipping weight and carrying capacity.
They are well built units and should last you a long time into the future.
Here are 2 forums you might want to check out:
5thWheelForums.com :: Index
Suites Owners International Travel Club Forum
Lot of traffic from Suites owners on the above sites.