I have two fat tire 2016 Radrovers with over 3700 miles on each of them. I'm still able to ride around 22-26 miles on my original 11.6 Ah batteries depending on PAS level 2 at 12-16 mph on paved level ground with pedaling power. I live in the desert southwest and do a good mix of paved, 6000-7000 feet foothills riding, and single track riding near the Rio Grande river. What saved me many times is having a rear bike rack with fold out panniers (Topeak MTX trunk bag DXP). I'm able to carry everything I need from tools, portable air pump, spare tube, water, wet or cold weather gear, spare battery, flashlight, work commuting stuff, etc... depending on the ride.
Once you figure out your price range, I would look at the type of ebikes in that range and the mix of riding you are currently doing (and future rides). I would also look at battery sizes and go for the largest or think about purchasing a back-up battery if you think you need 2X the range to CYA. Some folks hate throttles; but, I love them. I've had a few "mishaps" when trail riding like broke my handlebar stem on a wipeout, lost a pedal crank, or injured my leg. Having a throttle saved my from having to push the ebike 5-7 miles because I couldn't pedal.
I wouldn't rule out folding ebikes with plus size or fat tires. You can have very similar off road capabilities and range. You can use a rear hitch rack or toss in the rear hatch at the end of the day and you will have easy storage at home. My two fat tire ebikes take up A LOT of real estate and very hard to transport, need certain rack features/upgrades, and need space to store at home.