Lippert slide motor parts available from lci1.com, PPL Motorhomes, or RV parts suppliers. Motor only or complete gearbox options. Diagnose whether motor or gears failed to determine best replacement approach.
Coleman Mach motor replacement with different shaft length needs wheel position adjustment, shaft coupler, or careful shaft trimming. Use puller to remove stuck blower wheel, never pry.
Your concerns about the 2022 Newmar Bay Star 3609 are valid - steering play combined with uneven right front tire wear at only 11k miles suggests issues beyond normal F-53 characteristics, even with Liquid Springs and Safe T Plus installed.
Off-center steering wheel fixed by adjusting tie rods equally both sides. Return to alignment shop if recently done - they should fix free.
When your RV water pump fails, pull over immediately and call roadside assistance. Never drive with a failed pump. Prevent failures with regular inspection and replacement every 60-100K miles.
Your 1991 E350's symptoms don't clearly indicate oil pump failure - the consistently low oil pressure combined with low operating temps suggests possible gauge issues or sending unit problems rather than pump failure.