J30 Hibernation

[Lakelad]

Hi, I have a 93 J30t with 62K mi that I have been storing each Dec-May for the past 5yrs. Preparation has been pretty straight forward -full clean & wax plus leather dressing done at a detail shop; oilchange; full tank of gas w/ stabilizer; battery removed. Sits under a 'breathable' cover in a semi-heated (rarely below 25F) garage with a concrete floor that has been overlaid with a tarp. Tires rest on pieces of wool carpet.Yearly 'awakenings' have not been a problem to this point - all theelectronics come up fine and engine catches first crank, runs alittle rough initially but settles down within 30sec. Didn't have a chance to 'road' it this summer and will now be leaving it stored until next spring.Seeking input from the group as to what additional measures I shud take for the longer storage period (approx 18mo). Am particularly concerned about any engine/transmission seals that might be affected.Thx.