Hi RDT,
See here in our FILES section, (Look for the tab on at the top of the forum) for the 1981 sales brochure and download a copy. The brochure lists the spec's on your 81, 17 1/2 SB.
https://www.sunlineclub.com/forums/d...o=file&id=5473
By the brochure, it lists a dry (empty, no battery and no LP gas) 2,090# axle weight with a 260# dry tongue weight. 2,090 + 260 = 2,350# GVW (Gross Vehicle Weight) the day it left Sunline with no added options.
The camper is rated at 4,200# GVWR.
Hope this helps and good luck with your sale.
John
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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