Similar to many above, I do the following:
1-Do most of you leave the sending units on the coach tires 24/7, even in storage?
Sending units come off the MOHO for winter storage only.
2- Will the battery life be effected if the sending units are on the vehicle tires?
Yes, but as pointed out above they are easy to change and inexpensive.
3-How many also take the sending units off the tires of the toad?
They are only on the car when it is being towed. I did remove the security caps to reduce the size/weight and make the installation/removal easier.
Lastly, as Sarah pointed out, TST will provide new O-rings if needed at little to no cost. Also, thanks Sarah for posting, that shows (to me) a genuine interest in customer satisfaction.
Lou
05 Travel Supreme Envoy (with four trouble free years using a TST 507 System)