wow, nice .. I have not seen one that clean in almost 50 years but then again I was in MO and then the northeast during their time .. G744 is spot-on with his comment . In heavy transport school we spent the first week lockstep on all three versions of the M151 before being free to move self-pace onto the bigger stuff.. As for rollovers, the A1 is safer than its predecessor but it is not fool-proof ..
Other than increased noise, the hardtop can save you in at least one type of accident I was tasked to respond to .. It was an A1 w/hardtop, Bn Maint's jeep .. 3 fellas were headed from Bn OMS to Bn HQ and a car ran a red light .. Jeep driver slammed on brakes and swerved (a BIG no-no) which immediately flipped it on its side .. The occupants got banged up a bit but otherwise OK.. Luckily it was a 25mph incident.. Had it been a ragtop it likely would've gone all the way over, smush... 4 of us flipped the jeep back onto its wheels and after an overall inspection it was driven away...
I am one of those who believes from 1st-hand experience a seat belt will kill ya or save ya depending on accident and type of vehicle .. In one particular jeep (CJ) rollover which i was a passenger in, it was very good i got dumped out when and where i did.. My face woulda been smashed against a 4ft round boulder had i been wearing a belt ,,, meaning, I would not be here writing this and my 2nd son woulda never been born.. I've also been in ones where a belt helped greatly
Have fun with your M151, but too much fun is gonna hurt ya ! ... Keep the fun in a straight line , and be very careful on the corners .. As you have just read, a 20-25mph swerve will flip it .. PS, they are fantastic climbers , but again, keep it in a STRAIGHT line and you will be okay .. My only personal beef with them was the vibration and they lack a Hi/Lo transfer case .. My personal likes about them was that they are "fast" on the road and are very nimble off-road, the suspension does wonders... However I prefer my M38A1 and my M38(A5) over a M151 for tight-quarters, slow-going, off-roading due to having a Hi/Lo range box