Thanks for info so far guys, . . . especially Ur's JCL.

OK. So far:

1. '04 and after have beefier capabilities
2. 1st gear on manual transmission will work fine
3. Know about and have driven the Steptronic, just doesn't have the "bimmer" experience I've come to love (95% of my driving in this machine will be w/o the trailer.
4. I'm launching in saltwater, so bumper/mufflers/wheels/etc. exposure is a constant concern, . . . may have to get a trailer arm extender . . . can certainly solve that problem.
5. Yes, I have weighed the load (loaded) at 5800 +/- 100.
6. I've worked my M54s hard over the years, not concerned about revving 4-5k for a stretch to tackle a grade.
7. Will splurge for the OEM hitch and wires based on everyone's advice on that.

So, 2 additional questions:

1. BavAuto recommended AGAINST the self leveling suspension . . . prone to failures, expensive to repair, etc. Comments?

2. On previous vehicles, the transmission has been the weak link in towing, dissipating heat, etc. On the '04 and after, which is stronger, the manual trans or the steptronic?

Thanks - M54 Lover
Retired '98 328i, '93 525iT