By deciphering the VIN plate (up to a point anyway)
For example
SALLDVBV7FA 1234567 is a 90 CSW, that is a RHD, 5-speed, (3.5) V8 built in 1989
Breaking it down
SA = Rover Group
L = Land Rover
LD =Stage 2
*
V =Wheelbase
(H = 110", K = 127", R = 110", S= 110" Military, V =92.9")
A= Body Type (A= Truck-Cab, Soft-Top, Pick-Up. B = SWB Station Wagon, E = 2-door Crew-Cab(?!), F = 4 door Crew-Cab, H = HCPU, M = LWB Station Wagon)
V = Engine
(B= diesel-Turbo, C= 2.5 N/A diesel, D = 2.5 petrol, F =Tdi, G = 2.3 diesel, H = 2.3 ptreol, M = 3.9EFi petrol, V = 3.5(carb) Petrol, Y = T16 petrol, Z= 3.9 Isuzu diesel ('Oz' only)
7 =Steering & Gearbox
(1= RHD, 4-speed manual, 2 = LHD 4-speed manual, 7 = RHD 5-speed manual, 8 = LHD 5-speed manual)
F= Model Year
( A = 1983/84, B = 1985/87, E= 1988, F= 1989, G = 1990, H = 1991, J = 1992, K = 1993, L = 1994, M = 1995, N = 1966)
FA =Assembly Location
(A= Solihull, FA= overseas)
Hope this helps, sorry it's not too clear on the distinctions between the 'commercial varients)
*Coil-Sprung 'utility'
if it was a truck cab there may still be the lashing rings along the body side. also evidence on the rear Xmember of the tailgate hinges.
may also be on the top of the lower half of the rear door aperature the little brackets that held on the tailgate wires.
I'm sure that early 90 Station Wagons (up to perhaps the Diesel-Turbo?) had the rope lugs in-situ anyway :-k
'Ditto' the cross-member tailgate hinge mounts
Although, I stand to be corrected