Different guy from Ride-On called me today, said to use the moto product on a Tri in all 3 tires. Said the Spider, with 3 car tires, can use the auto product. So I will go with the moto stuff, will probably order 5 tubes so I can go over the minimum dose as needed. Will check on Amazon price and go from there.
Thanks for all the comments, guys!
Just remember that this is a product that more is not better. So don't go over the max amount. You can get too much and create a balance problem. I highly suspect that's exactly what some have done that don't like the product and make claims it doesn't work. It does work when used as recommended.