Back to the tire issues:
Trailer tires, because they are abused by design, only last 5 years MAX! Yes, they can last longer, but when they grenade, they usually take out body, undercarriage, waste tanks.......ETC. After Steve arrived to St. A, I inspected all 6 of his trailer tires (Which he thought had all been replaced in the last 4 years), to find that 2 were dated 2010(1 of which came apart 1/2 way to St. A), 2 were 2013, and 2 were 2015, and his spare which should only be used as a spare, was original and dated 2008.
Moral of the story:
Check your tire dates!!!!! Don't risk damage, just replace the damn things before the destroy something else or ruin your trip! You can always sell your "used" trailer tires as someone will always need a spare.