I generally buy the cam locks here, changing the dratted CH751's to something else. Our 5er spends much of the summer at a virtually deserted during the week CG that has ease of access from a seldom traveled town road:
https://www.mcmaster.com/locks/cam-locks-and-latches/.
On the last 5er I used the tubular keyed version but they started getting very sticky after a year or so. I use a common though keyed alike style this time. Yes, I prefer keeping compartments locked - my choice and hope a thief decides the neighbor's trailer is easier pickings if his CH751 wont work. As far as the side slam locks - can't easily change them, only the front storage area complete with my $700 disc brake actuator, $150 NAPA Gold battery and a $5 bottle of truck oil.