Sounds like he was towing this home new/empty. So it's reasonable to assume that it does not weight much more than the 9000lb ship weight from the sticker, which he stated. 8000 lbs on the axles, plus TW...sounds about right.
Yeah, 1000 lbs bars are not enough. You are probably right there (see above calculation), and it's already porpoising. Classic reaction when you are at or near the springbar rating. Same thing happened to us when we used a 400 lb Single Bar WDH to tow our old 3000 lb camper (375lbs TW).
Also, the E2 is not going to be as good for sway control, compared to the full-blown 4-point Equal-I-zer.
By the time you load this beast, you will likely be at or over 1100 lbs TW. That's actually too close to 1200 to me. I'd go with a 1400 lbs Equal-I-zer 4pt sway control hitch kit.
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