I am sorry to report that we offer no custom-fit hitches for your 1989 Jeep Grand Wagoneer, neither rear-mount nor front-mount.
We do offer frame-mount hitches for RVs that offer adjustability to fit various sizes of trailer and motorhome frames; these are all shown on the linked page. To determine if one of these will fit you will need to get under the GW to see if there is frame access and what the frame width is. You would definitely need to drill into the frame unless you chose to... view full answer...
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