The normal payload for 7.5tonne vehicles is about 3-3.5tonnes (strangely 6.5tonne wagons normally have a slightly higher payload, but still not enough)
As MM says, you would need two trips in a 7.5tonner
I drive a HGV with a tare weight (empty) of 7 Tonnes, Gross weight (Full weight) of 12 Tonnes thus giving a Net weight (payload, carrying capacity) of 5 Tonnes. Be very carefull as darren says, VOSA are VERY strict!
If I split the load in 2 would I be able to do it in a twin wheel base or long wheelbase Transit (etc)?
P.S.
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