Awesome answer peteroznewman, thank you you are gem, in this community.

Yes wheel are supported on T girder( acting as point load on T girder (two wheels front wheel & rear wheel of crane stand on T girder) ( do I need apply wheel load as point load or remote load on T girder?)
Just my last query
And in which case than i can use joint.
What's difference between joint and remote load(for long imaginary position of load applied), in my case cant i fix both extreme ends by joints?

How should I apply hydrostatic load, as a pressure force over hull which is immersed in water? (pgh)
Can I also add dynamic loads of sea along with hydrostatic?

What is sense of applying remote load and not fixed load ( just because I have 25% sliced hull, not full hull)

What kind of stiffness remote point create? Will they compensate for rest 75% hull part which I not made by providing stiffness?

You not answered, as my tug (25% made) is shell element, so on extreme ends, I should apply CERIG, I guess?
Shell doesn't support drilling rotation dof(example if beam connected to shell element and if we provide beam a torque, beam will rotate around it's axis, because,drilling rotation not supported by shell element,thus in nastran wr apply rigid load) , that's reason you are trying to put remote loads on tug extreme ends? Instead of fixed ends?