Welcome!
You have an M-20? H'mm, by chance do you have a Sunline 2007 Advancer 20?
If so, Sunline created a travel trailer with special access features. This would be the sales brochure for it. There was not many of them made.
https://www.sunlineclub.com/forums/d...o=file&id=5523
The M part, if the M came from looking up on the NADA RV value site, that explains the M. Not exactly sure why they added the M, as they did that on all models. Sunline used T for travel trailers in most all cases. This 2007 Advancer is so special I'm not sure what is called out on you VIN tag. You may be the first member to have one.
If we can see some pics of it would be super!
Thanks
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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