@rustyshibley, a cs-s is a clamshell, if an older model, with just the basic or standard options available at the time. The cs-s max is a model offered with all the options. I'm not sure if Nücamp offers the trailers that way any more. A few years ago you could purchase a basic model a mid-range model, and the max with all the bells and whistles. Are you looking to purchase new or new to you?
The Max version was the loaded package from the previous 3 package system. It included AC, TVs, Jensen, maybe the front window, a bench instead of the current counter/drawer unit, frig. We ordered the Basic and added options. The 3 package system was discontinued after the 2017 model.
You will want to make sure the S model has a Norcold vent fan to exhaust the heat from the frig - that was second half of 2015 - early 2016's I think. Upgraded cushions with the 2016 models, late 2016/2017 with shades that pull up and screens that pull down ( earlier models were reversed and had shade sag problems), electric brakes late 2014 addition?, Lagun table and bed slats standard starting late 2016/early 2017. When did they add the pull out steps?
From a thread - changes for 2016:
3D Logos
100% Azdel Backers
Radial Tires (2015)
30 amp power cord w/ built in LED light (2015)
Fantastic Fans will be clamp on which makes them screw free
Corrugated underbelly protectant & insulation
No fabric on window valances (they will be like the Outback)
Seat Panel Finger Inserts for Finished Look & EZ Opening
Upgraded upholstery foam density
Late 2016 -added Digital Alde display
And another thread: They have made standard in 2017: included bed slats with a cleat to secure the slats, Lagun table, shades that pull up rather than pull down, screens that pull down rather than pull up, struts to support the cabinet doors, different faucet in the galley sink.
2018 model changes: Different upholstery CS models with standard front counter and cabinets Standard front window and outside
The "Max" label was from the time prior to spring 2017 when nuCamp/PV was associated with Little Guy. As dragonsdofly indicated, it was the top trim level. However, the lower trim levels were pretty rare outside of special order, so I suspect nuCamp just dropped the suffix in the interest of simplicity.
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Draco dormiens numquam titilandus.
May 2017
From a thread - changes for 2016:
2018 model changes:
Different upholstery
CS models with standard front counter and cabinets
Standard front window and outside
2013 CS-S us@gi
2015 Toyota Tacoma PreRunner Double Cab