Maybe not
I suspect that picture was taken by an astronaut from the outside of the LM. If so, then the LM was depressurized at the time and was probably sagging under its own weight. When pressurized, the LM was strong enough to withstand the loads of landing and liftoff. You're right about the LM not being a good basis for a rover and that the skin was very thin, but like a soda can (or Atlas rocket), when pressurized it is pretty strong.