I bought the HD 4 which is good up to 140 pounds and two additional sensors. I did not purchase additional sensors for the toad. The sensors worked well with the SuperNova without needing the booster option.
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2008 SuperNova (6331)
2011 Jeep Wrangler (Toad)
Now: 2011 Winnebago Journey Express
2011 Silverado 4x4 Texas Edition Extended Cab (Toad)
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