Jimmy,
Newell puts a dash mounted switch to shift weight to the tag for such reasons.
If you installed an auto sensing device then some valveing would have to be used to discern tag from drive.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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