Sewer pipe engineering?

[surfer46us]

I have been doing some extensive research about ABS sewer pipe.
(I know...I need to get a life!). What I learned is that ABS pipe
contracts/expands 5 inches per 100 feet for each 10 degrees F.
change in temperature. Applying this to the approximately 6.5 feet
of pipe connecting the black and gray tanks, there is nearly 3/8 ths
inch of expansion with 100 degrees change of temperature. It appears
to me that this puts excessive strain on the tanks that could cause
cracking. I am going to saw the pipes in too on each side between
the dump valves and the 90 degree bend and reconnect them with
flexible
hose clamp type unions. I would appreciate some opinions pro and con
if this idea is sensible? Also did all Wanderlodges come with the
tanks plumbed together with no provision for pipe expansion or does
mine have a non standard repair? Thanks

Jim Keefauver/Jonesborough, Tn./1985 PT36