What's wrong with the gimbal mount that came with the unit?
As far as "abuse", if the unit can't withstand the vibration of going across the water, maybe you need a different unit.
After some thought...
I see sonars mounted at deck level all over. The average guy is probably 5'10"-5'11". If the unit is mounted on deck, you are at about 5' from eye level to screen. If you are standing or using the bike seat, and the sun is glaring, what use is having one on the bow? Why not mount it on a pedestal where you can actually see some useful information. I'm not a bass guy, but I installed a seat base on the bow and built a pedestal using a seat pedestal to hold the sonar, so if someone is sitting in the chair, the screen is pretty much in your face.. Just wondering. Except for impressing other fishermen with all of the electronics, what's the point?
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115
Bitter Gun Owner