I MO,
Thermo package, yes, as for noted reasons stated, also keeps interior a few shade darker during the day.
Vents, my Hawk order included fantastic fan and vent, put fan over galley area, I ended up installing extra fan over gallery area to make lowering top easier.
Hot Water Tank, it gives you an extra 5 gals of water so I opted out of that, have just used a kettle to heat water, more storage space inside, does not change the outside.
Ref, ordered the ac/dc (waco) unit, one size back then, with dual batteries, 3way works best when level, a lot of times its not always level.
Any other items are up users choice, with a 3/4 ton truck you won't have any problems on loading it up or packing it with goodies.
Have a good time when you get the Hawk and Happy Trails To You
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