(real much depends on your size- im 185 and mid 40's)

imo- i actually like a smaller hand truck for tight corners, halls, ect- pin machines are really not that big (if i was doing fridge units it would be different), i prefer a nimble dolly- its just me.

i do feel ratchet straps are a must- but they dont have to be attached to the dolly, if your moving appliaces all the time all day ya its convenyant, but i only use my dolly maybe onec a month on ave. (still that 1 times a month pays for itself every time-imo)

also i dont know how much stairs you plan on doing? but i only have 4 or so, and i have a ramp-2x4 w/plywood covered, and its nice and easy....

i understand your point- wives love pinball more when there not on the end of 250 pound, best to keep them on your good side..... you need some dolly, its a must have- what ever you choose it will be worth it