I'm late to the party, but Ram Mounts are the best product on the market. Prices are pretty reasonable, it's all made in USA and engineered by smart people. The company I work for cooperates with them on law enforcement and military applications.
It's not worth cheaping out on this stuff (not saying you are, just an observation). These units are heavy enough to do real damage in an accident - you don't want them to become airborne (ever).
Get a Ram mount - they have every conceivable design you could think of. I really like the ones that use the seat brackets to mount a vertical pole. It's overkill, but you can remove them easily when they aren't needed. Sturdy, safe and adjustable. Suction cups don't last all that long before they deform in the heat.
2014 Forest River Shamrock 21DK
2012 Ford Expedition Limited
Load Leveler / Sway Bar (800#)
Tekonsha P3 Prodigy Brake Controller
2016 - Four trips, 11 states, 19 nights
2015 - Four trips, 12 states, 17 nights