AGM batteries offer many advantages over conventional batteries .
AGM  do not leak acid . Eliminate possible battery tray corrosion .
AGM batteries recharge faster than conventional .
AGM batteries may be drawn down further than conventional without as much damage to battery life .
AGM batteries have a 40% longer service life .
AGM batteries cost about 60 % more than conventional .
We boondock camp with no solar and no genny and operate from the 2 AGM tow vehicle batteries and the 2 conventional RV batteries simultaneously .
We use 12 foot Heavy Duty jumper cables while camped .
Optima is the most widely used AGM name .
I bought 2 Exide EDGE  AGM  batteries for $ 140 each in a group 78 size for my duramax at my local Bi-Mart store . I installed them myself .
That was the best priced ( domestic )  AGM  that I could find .
Exide makes their own AGM batteries in the USA .
The absolute cheapest AGM batteries come from Asia .
Exide has a website that lists their AGM lineup with sizes .
Exide EDGE  is the nomenclature for their AGM .
The Exide Edge batteries have a 4 year full replacement warranty .