“The upper address sag better and the lower address sway better”
Either way (all other notions here aside…), I would definitely go with the uppers which are required to ‘make usable’ the 1 ton’s upper leaf…
BTW, my apologies per the drilling aspect…My Ram’s lower-most leaf (which per my spring guy is considered an overload) was OEM pre-drilled with a rubber plug installed – FWIW, the stable-load kit does come with a carbide tipped drill bit for this very purpose.
Maybe others will chime in as well, but considering the relatively light weight of your Hallmark, and since you already have the x-tra camper leaf, I can’t imagine a need for the lowers. When I added the extra leaf, I took the lowers off. Had I loaded your camper, I seriously doubt I would have needed anything.
Phil
