X2 on the Cobra CDR 840 dash cam.
Have one in the car and one in the MH. No issue placing it on the windshield in the RV. The mount adjusts every which way. The software is updated fairly often (just updated mine for a trip) and the video presentation is really nice with the tie-in to Google Maps.
Just had an occasion to use it last week while driving the car. Someone cut in front of me in a turn lane and buggered up my front bumper. No big deal (other than $800 to fix it) but as soon as it happened, I just pushed the little orange button to make sure the video segment was locked and wouldn't be overwritten.
Then the "discussion" started. The guy was getting all excited about how it was my fault and I hit him etc, etc. Yeah, right up until my wife said sweetly ... "But we have you on the dash cam." That took care of it.