There is already a database of repeaters on repeaterbook.com. Still you have to program the freq, offset and PL tones for each one. Not an easy task in heavy traffic although you could add everything before you left. DMR always has someone talking and switching to a tac channel for a QSO is much easier than programming in a repeater. I hear people all the time, driving trucks in the USA and Europe on DMR. One guy talks while out walking his dog. There is even a radio out not that has the cell, hotspot and radio all in one device. Pricey but convenient. I have an anytone 878 with an openspot3 and use my cellphone for wifi. I can carry it in my pocket and take it anywhere. Too much trouble for me to add antennas and such. I have a portable HF rig if I want traditional when I get where I'm going.
The downside to DMR is you can't listen to trucks for traffic etc but if I'm stuck in a parking lot going somewhere like I95 I can still entertain myself.
I used an HT with a mag mount on my 2500 on a trip to Florida. Nothing not a peep on national calling channel and I tried every 10-20 miles.