I bought a 1975 volvo TGB11 truck on the east coast and I'm wanting to drive it across the country to the west coast. The tires are old Michelin XS tires with some tread left (can be regrooved I'm told) but they have some sidewall cracks. Now they have tubes in them so I'm wondering if I should be okay driving them across the country like this. Note that I will be doing 55mph max and driving in winter which I'm hoping should reduce them heating up too much. See attached photos of tires.