I've got an hds7 on the smaller ram mount, and the hds8 on the larger one. When I get to the water, I usually have to loosen the smaller one and reposition it, cause it will always give over from the drive, but my big unit is up front and it sets there just as I left it on the D ram mount. I just dont think I would like the hds8 on the smaller mount at all. It has vibration absorpsion as it should and will do what you want for you. I bought expensive fishing electronics, and supplies and a cheap boat. To everyone his own. Good luck with whatever you choose.