I believe coverage for the vehicle while in their possession is covered by their insurance. Once the vehicle is on the ground it would be covered by your insurance. Just make sure you they show proof of insurance for the shipping before you turn the vehicle over to them. Log mileage and...
It will not affect sensitivity much if any. Here is the one I ordered off Amazon, works great. https://www.amazon.com/dp/B0CFVYQSZZ?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1