Before this thread degenerates into Ford vs. Chevy deadlock I'd like to say that in my opinion Utes could be added, but only after LFS has actually produced a convincing grunty large engine.
There are two types of racing pick ups worth talking about, first being the Aussie Utes which are based on the same modern monocoque construction as a Holden/Ford muscle car, they are in essence the same as a V8u Supercar with obviously a lighter rear end and less power, by the time one is building a racing car from shell up most of the strutural rigidity issues can be ironed out.
The other type of pick up racing is the Nascar Craftsman Trucks (bare with me), whilst normally confined to ovals they are a 1600 kg tubular steel space frame construction producing over 650 bhp from a full race Chevy V8 revving to 9200 rpm. On road courses in N2003 they produce the best racing I've ever had in anything apart from LFS. All things considered these things are slightly slower than the FOX, which is still very fast by terms of anything that you'll have driven (faster than 911/M3s round the 'ring).
They run on slick tires but are still pretty basic well sorted cars, still on an open diff and a 4 speed racing box, and importantly as they are effectively a Nascar with lower rear bodywork they are not overly tail happy. The main problems in simulating them would be that they've been driven to death in N2003 already and I don't feel LFS can really simulate a big full race engine (or any big engine), lastly they are peaky racing engines which still really need to be kept in a fairly high rev range, not as important as keeping a F5000 engine on cam, but it still won't give this right foot in any gear makes you go style torque usually experienced in big V8s.
If you want to race Utes in N2003 look here -
www.wr-racing.co.uk