It appears that the only difference is that the 1000 does not include a battery charger. The manual appears to indicate that these two units produce modified sine wave power, not true sine wave AC. It might be useful to verify this.
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OMG, the Silver Streak is Sold!
2006 SMB EB45ish.
5.4L, QuadVan 4x4
Ready to Rumble!
You may want to consider that a new 1000w true sinewave inverter is under $300.00 retail. Perhaps adjusting your price a bit will help sell the one you have. GLWS.