Thats the one of the main reasons I went AGM 6v. The Full Rivers fit under my steps. Only room for TWO on my model. Not sure on the height but you can look up all the dimensions on line.
I had them 2 years now and LOVE THEM. Zero maintance. Hold charge much longer when in storage (I dont even plug in my RV in the winter since I drive it every 3 or 4 weeks - but we have very mild winter too) more compacity over the OEM setup.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor