I doubt rust is an issue for you in Kenya, and providing the remainder of the chassis is without fault, go ahead and repair it. Best wthing to do would be to drill a hole at the end of the crack, Vee it out, and weld the crack. With a torch, locally stress relieve the weld, by brining it up to a cherry color, and letting it cool as slowly as possible. Then, weld a fishplate over that area, with an inch or two of material either side of the repaired crack. There is no problem with using a stainless rod, such as 308-16, but it isn't necessary, a good 7018, or 9018 is good
Land Rover chassis are not made of a high tensile alloy, so welding to them won't cause problems down the road.
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