Do not trust the initial dealer setup. The TW could change significantly after you load up your stuff in the camper.
If the dealer sets up the WDH, have them err on the side of assuming TW will increase, after you load in your stuff. Then, when you actually get it loaded, use the manual to check the settings yourself. It's not difficult to make small adjustments to the amount of weight distribution. But you do need an hour or more, as the head needs to come off of the shank. As long as the dealer does the initial setup correctly, you should not need to adjust the L-brackets on the trailer. Those only need adjusting if they are way off.
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller