If it showed values, and was a one round force, then the jump need not show a huge hand. If it could be passed (say KJxx x Qxxxxx xx) then the jump to 3♠ shows the hand Justin expects.
In the former case, a trump lead (what? a trump lead surprises you? I bet not) probably beats game: picture K10x AKxxx x AJxx... a minimum opposite a one round force perhaps but surely too much to bid 2♠ on.
In the latter case, opener may hold AQx AKxxx AJxx and now I need to be in game.
So I am going to do what is a first for me: abstain
If I am not allowed to abstain, then I guess 4♠ just because I like bidding games and defence is the toughest part of the game. Plus with all you guys at the other table, this way i get a push
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