Towing 5800 lbs w/04 6 Speed

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Hi All - I'm new here. Replacing my '98 328i 5 speed and Chevy Suburban with a manual X5!!

Definitely want a manual unless it is highly inadvisable in a towing application. Looking at the '04 3.0i 6 speed, but will consider anything from '01-on if all considerations warrant.

I'll be hauling our boat (photo attached) over mostly flat terrain but need to be mindful over getting the 5800 lbs. load out of the water on the various wet ramps.

I'll be using a large wheel chock, in addition to the parking break, while starting out in 1st gear on the incline.

Anyone have experience with this??

Specs show the 1st gear ratios for 5 speeds thru '03 at 5.09:1, and 6 speeds '04 on at 5.13:1.

The ratios seem high enough for a slow acceleration while heavily loaded from stop, and close enough that I wouldn't necessarily require one transmission (year) over the other.

Any ideas?

Thanks in Advance - M54 Lover.