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Since my battery monitor will show amperage drain, I went through all the electrical items on our trailer one by one so that I would know how many amps each pulled. Here's the list, which apart from a few items like the fridge and inverter, should apply to most Ollies: All lights off, no fridge, no inverter - 1.2 A All lights off, fridge running, no inverter - 3.7 All lights on, no fridge, no inverter - 5.7 All lights + fridge - 8.2 All lights + fridge and inverter - 10.2 Fridge - 2.5 (3.5 starting) Inverter - 2.0 Reading lights, all - 0.3 Outside lights, each side - 0.7 Outside courtesy - 0.1 Inside courtesy - 0.1 Cabinet lights - 1.1 Main cabin overhead - 0.6 Right bed overhead - 0.3 Left - 0.3 Kitchen - 0.3 Dinette - 0.3 So I have 1.2 amps of parasitic drain. That's probably higher than most, since it includes my Cradlepoint router and Victron stuff. It's enough to kill my batteries in 12 ½ days, which I've verified. Solar is more than enough to keep on top of it of course, but if I were to cover the trailer or store it inside or in the shade, I'd want to disconnect the batteries.

I have the 2018 RAM ecodiesel and love it. I believe I have the same axle ratio as you quote. It tows the Ollie beautifully and I love the low end torque. We got around 17 mpg over the Appalachians although I only formally checked 1 fill up. Got nearly 28 mpg highway on way to Hohenwald. We have the integrated towing package which is nice for the brake trailer display and setting. Weird that yours is not at least wired for electric brakes. The tow package (the tow setting) is nice for the downshifting and braking. Yes there is some added expense with DEF but refeills come only after about 10,000 miles which is the oil change interval. Will likely get my DEF from autozone, but I think you can get it a truck stops at the pump which would most likely be cheaper.

On our ollie( hull #219) there are two ways two remove power from the D.C. Circuit, in the upper rear compartment there are a set of switches, and under the street side bed ( twin bed) there is a sail switch that a flag pops up when it is activated. But Garryand kristi is correct, even with both switches off there is still a parasitic drain from the co2 detector, the smoke detector has a 9 volt battery in it. Steve

We own the 2015 Jeep Grand Cherokee Overland diesel described in the thread you mention. The tow capacity is 7,200 lbs (it's a 4x4.) My experience (Russ') with the mpg has ranged from 14.8 driving into a cold front from Florida to St. Louis to 19.0 from St. Louis to St. George, Utah (going down a gradual plateau after passing over the continental divide in Colorado.) Overall, I believe it averages ~17.0. It makes a great tow vehicle for those for whom a truck is not an attractive alternative. The only con I see is less storage space, which we mitigate with a roof rack, and the front hitch basket Oliver provides as an option. Russ & Mary Caslin