Thanks - my worrisome mind will have me using 6 tie downs most likely, along with tying the wheels to the track. ;-T
I just hope for the first few hundred miles I can keep my eyes on the road and not the rear view camera!! ;D ;D
One of the best ways I have found to secure motorcycle wheels to carriers is not to use tie downs. Tie downs are best used to secure the bike itself.
Use 2" wide webbing that holds the wheel itself to the carrier. That eliminates any upward movement of the wheel away from the carrier. Instead of buckles and so on which limit how tight you can make them without getting all gumbled up, you can use the velcro kind (sold at lots of sporting goods stores). You just make a couple of wrapping around the wheel (lowest part resting on the carrier) and there is no way the wheel can lift off the carrier.
Them the tie down on the bike need only keep it level and from rocking back and forth. What you want to avoid is using tie down to hold the wheels to the carrier by putting pressure on the handlebars or forks. You will see people compressing the forks and really cranking down the tie downs. Big mistake and counter productive. You want everything taunt above the wheels but not to the point where the forks are completely compressed. First, you are unlikely to get the forks compressed that far and second you'll then end up with either the front or read not fully compressed and that just makes for a rocking chair.
A piece of foam on the handlebar closest to the rear of your coach does wonder for possible contact, stuff happens.
Whatever you do with this kind of carrier, don't put any tie down on the handlebar ends, they can and will bend.
If the tires don't take up all the space in the tracks, block them, I've used really thick rubber hose but anything will work. Secure them with bungees.
Just some tips.