Being right at the limit of a WDH system won't break anything, nut it won't be stiff enough. I believe this is where a lot of people get that porpoising effect, where the bars are just constantly flexing and springing.
1400 lbs bars (as was said) might end up having not enough flex, and giving you a harsh ride. Imagine your car with springs that were too stiff. Suspension would not absorb bumps.
1200 sounds like your sweet spot.
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