Thanks for the details everyone.
It took me a bit of fiddling around to get the jack bracket in the correct place. I had to shift the internal gas tank a bit so that the wheel wrench would fit between the tank and the rear cab wall braces.
All good now and everything seems to be tightly held by the spring so they various pieces shouldn't bounce and rattle while on the road.

When God gives any man wealth and possessions, and enables him to enjoy them, to accept his lot and be happy in his work�this is a gift of God. He seldom reflects on the days of his life, because God keeps him occupied with gladness of heart. Ecclesiastes 5:19-20