My wife will be driving our car and I will drive the spyder from Mn to Ca this fall. We have Scala rider helmet to helmet communications when we are both on the spyder but I was wondering if there is another option for when she is driving the car. Her wearing the helmet while driving was a firm NO! We will be on the road for about 4 days. We do have cell phones which will work if we get separated but less than ideal. Normally the spyder is on a trailer behind the motorhome and the wife is in the co-pilots seat in the motorhome. The car cannot tow a trailer. Any suggestions.?