Best to check with Old Sarum SFC as they are up to date with all Shadow situations.
afaik the Shadow has very few AD's [good sign] The undercarriage needed replacing [but plenty of Shadows around the world are still using the earlier version]. A panic stricken takeover of CFM by persons unsuited to the task, caused a problem with a tailplane spigot [only one break and that caused by utter stupidity by the instructor/owner]
My only advice would be to tie down the Shadow by the nose leg [above the pivoting wheel, which is held/attached by a stainless steel multistrand wire]. Then the tailplane skid will be
off the ground and not be subject to side forces from gusts of wind.
The 503 is one of Rotax's best engines. Mine was serviced at SFC and never missed a beat. Unleaded mogas suited mine much more than 100LL btw.
If you do decide to buy a Shadow, talk to Fiona at SFC and if she advises this or that, do it! You will not regret it! Apart from being a superb pilot she is a Serious Engineer! And she is also an Instructors Instructor.
Ask her how her Maine Coon cat Pushka is and you will be 'in'.
Finally, there isn't a lot of room in the back. No lardies!
I am a lardie and yet in all the years I owned Shadows and a Star Streak I never had a main undercarriage problem or a nosewheel one either. And I landed in farmers harvested fields, operated from a number of farm strips etc.
Anyway whatever you buy - have fun!