Tell me about this truck

Bought a 01 Ram 1500 from my daughter, paid off her note. She bought it new, then later, incorporated the truck note as part of consolodation loan. I never owned a Dodge product before. She took good care of it. Vehicle has 92K on it. Has the V6 in it, auto tranny. The original owners manual is in the glove box (who puts gloves in there?). I'll be taking regular 5 mile trips to work, and back, everyday. The manual has 2 sets of maintenance guides, depending on the mileage you put on it on daily basis. One glaring difference is changing the lube in the rear axle much more often for low mileage daily driving. She says she's never had it changed. What's up with that regarding the axle lube stuff? Dave