Hey Bob
Like Jim we added the Tireminder from CW. We had a bit of trouble with them but got them working finally when I found out the battery connector on one wheel unit had a broken solder connection.
The ramp with a Harley or any large heavy bike is a challenge going up or down. Throw in wet weather or dew and its very scary. I think I will add the small winch eventually and power up to the chock slowly under control.
I strongly recommend you check your d rings often and always tie down your bike. I had a front ring pull out and eventually all the movement finally allowed my Ultra to lean over and hit the short wall and damage it. (Keystone had to replace all our vinyl flooring under warranty after the main slide damaged the floor. Apparently the flooring installers removed the d rings and then reinstalled them and stripped the anchors threads by over torquing them. Luckily not too much damage but after I replaced all the hardware and added a second anchor to each d ring.
PS we've not had any tire issues with the Marathons but I guess that's not the average.
Anyways the 347 is a great unit and we've loved every trip out in it so far.
Good luck.