I've successfully used Rapid Remover
for pine sap on both my TT and TV. I am very careful about its application on the TT and avoid using it on an area where the edges of the TT's decals are applied.
As with all chemical solutions, try the product out on an inconspicuous area first. My TT is gel-coated fiberglass.
Here's what I do. Use the heaviest (most absorbent) paper towel you can find and cut it into 1" or 1.5" squares depending on the size of the sap marks. Saturate the squares with the Rapid Remover but not so much that they drip. Apply the squares to each sap mark and let them sit on the mark in the shade. Wait about 10-minutes and (one at a time) remove each square and immediately try to wipe-off the residue. If any remains, reapply a new saturated square and move on. Once all sap marks are gone, clean the area and apply a fresh coat of wax/sealant.
As always, YMMV.
Theo & Carol
2007 GoldenDoodle ("Cooper")
2020 Rockwood Roo 23IKSS
2015 F-150 4WD XLT SCab, 5.0L, 3.73, 36gal, HD Towing Pkg (53A), 1,980lb Payload