I have the same model (2021 Thor Mag SV34 w 6.7 diesel 4+4, 10 spd trans) and flat tow a 5,000lb Jeep. I run 65 Mph with the cruise on, the 6.7 with the 10 spd transmission climbs mountain passes without issue. Occasionally it will downshift a few gears but just keeps cruising. Its very rare that I need to kick the cruise off and then only for a short while. Downhill is a pleasure as well with the engine brake on it will hold you back nicely on steep downgrades. I believe the extra 2,000lbs you plan on towing will have minimal effect.
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RV: 2021 Class C Magnitude SV34
Toad: 2023 JLU Jeep Wrangler
Motorcycles: BMW K 1600 B, Harley Davidson Heritage Softail (EVO)
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