When I got the Viper pack I ran 5xERML on one of them, and it is not great but it is workable. You should really do it on the VPR-A, which has a 5% heat quirk when you use a set of 8: Went for the TC for the targeting info/range/crit chance bonus, but could easily do an extra HS instead for more DPS. Skills: https://kitlaan.gitlab.io/mwoskill/?p=jsonbin1.5b219c60859c5035d0d53c15#s=Weapons
4/5, Workable. Not the best 40 tonner but it can do mid-range poking fire support, with the jump jets allowing you to get to unusual places.