1/3 NL maniac straddles $100 every hand

an interesting situation happened last night where one player sits down, plays pretty aggro and builds and a huge stack in a matter of orbits and then starts straddling $18 every hand

within an hour that $18 straddle has become a $100 straddle

so it's become a game where he mostly takes down $4 each hand but occasionally someone will just call and see a flop with him or just rip it in where he usually calls

I've been thinking about a proper range against this player

i think the real factor here is the risk of players behind you coming over the top, IE A9 is probably a good hand to rip it in against this guy if you're last to act but not if there's still more players left behind who could easily have you crushed

so here's my initial thoughts

1. it's not worth limping because you're investing so much of your stack only to invite a squeeze behind you or give the maniac the option of checking his option where he can dictate the size of the pot preflop - ie he gets a freeroll to check his option and hope for gin when he has rags or he gets to pump it up the few times he has a made hand and then you're likely behind given that you're playing much wider than you usually would for the 33bb call

2. if people are squeezing vs limpers then just limping with premiums would be profitable (but this wasn't the dynamic of the table, everyone was turbo mucking because the maniac called all)

3. ranges
EP range = AQs+ JJ+ - but i think even this may be a little wide
MP range = ATs+ 99+ - this is probably too conservative though
LP range = Axs+, broadways, 55+ ?
last to act =Ax, broadways, all pairs

thoughts, how would you guys have responded?