Yes very easy to do with the truck on it’s tires. You need something to support the down pipe while you switch the cat-backs. Impact makes easy work of exhaust clamp bolts. Only thing I wish I had was a pair of exhaust hanger pliers. But I made do.
I use motion pro electronic and longacre on the race bikes. They are pricey, but are also highly accurate.
https://www.ogracing.com/products/longacre-pro-digital-tire-gauge-0-60-psi?gclid=EAIaIQobChMIgcH6hZmL7QIVh7zACh2rHAp1EAQYBiABEgI1svD_BwE...
Nothing to be concerned with but remember it’s been sitting outside for a year all ready. Be sure you get a great deal. Otherwise go with current model