Roof rack on sloped cap

Hey all,
Been looking for a camper style cap for a while. The used market seems to be slim where I live (southeast PA). Finally found a used A.R.E TW that I kinda dig for the extra headroom while camping.
The concern for me is I'd really like to have a roof rack on the cap but the tw model is at a considerable downard angle.
Are there racks that are adjustable so the front might sit higher than the back and keep them level?
Has anyone attached any kind of rack/basket to an angled cap like this? Im assuming I could do some kinda shimming but am wondering if there might be better options
Appreciate any insight in advance. Thanks!

 

I did this years ago using Yakima artificial gutters that bolt to the side of the toper then used Yakima gutter mounts to hold the cross bars. I used short mounts on the back and tall mounts on the front. Wish I had some pics. Google search Yakima Gutter mounts. Not sure if those mounts are still available though. Stole this pic from Google to show the height diff.

 

Very very cool. Definitely giving me some ideas and some things to google
Thank you!

 

Thule makes artificial rain gutter mounts #542 and makes 3 different height 300 Gutter feet

 

Yep, back in the day with my 86 I had a mid-rise with bars. You will want artificial gutter brackets and uneven towers.

 

3 for 3 the artificial gutters seem to be what I'm looking for. Thanks!