Old RV's

No, there is no issues with "top heavy". Just put something there to raise up the camper. I had an 04 TC that would hit the rails of a 99 truck, but just put the board pieces that I used to support the TC when off the truck and put those in the bed to raise up the TC.
IF selling then just tell the buyer the height of the wings so they can have something in their bed, or you can provide that something for them.
TCs make the truck top heavy, there is no escaping this.

Some people love the TC. I was glad to go back to a trailer as soon as I no longer needed to tow a trailer with it. Hook up is easy with a trailer and does not add all that wear onto the truck....

Build a platform to set it on, or sell it?
What type of suggestions were you envisioning?
Doubt it could possibly be more top heavy than many of the white whales produced since your vintage camper’s born on date.

We had an 02 Lance and I used a pair of 2x10s in the bed to raise the camper and the 1-1/2" was all I needed to clear the box sides and shark fin antenna on the cab.