Don't compromise your wing structure for the sake of not having to connect/diconnect two "quick disconnect" fittings. These are used exclusively by all of the jet pilots. I have never seen a tank mounted in or on top of the wing on a jet. I have used them on every plane I have ever equipped with retracts and I can say I never had any problems related to the quick disconnects.

GP Patriot
GP F-4
Trim Acft F-86
JMP Starfire
Hangar9 P-51
BVM T-33
BVM Ultraviper
Planes Plus F-86
JMP T-33

On the jets, I have two sets of quick disconnects due to the pneumatic wheel brakes.

I have had occasional air leaks but never at the quick disconnects. Mount your valve and tank in the fuselage where you have plenty of room.