As Ron suggested, there are two different issues:
- The towing capability of the Pace Arrow.
- The ability of the Excursion to be towed.
You can get the first from the list of weight ratings which should be on a plate mounted somewhere in the coach. Mine happens to be on the interior wall next to the driver's seat. I also have a paper one posted in a bathroom closet. The following apply to my particular coach (FWIW I tow a Suburban - weighs 7,000 lbs - with a Monaco diesel motorhome).
GCWR (Gross Combined Weight Rating): 42,800 lbs
GVWR (Gross Vehicle Weight Rating): 32,800 lbs
Towing capacity: 10,000 lbs
The first two numbers are on the plate and the third is merely the difference between the two. Check the weight of the Excursion to be sure it's below the third number. If it is, you'll still need to check the rating on the hitch at the rear of the coach. (It's usually stated right on the hitch).
As Ron suggested, you should be able to find out from your owners manual if the Excursion can be towed. With 4WD vehicles it's usually just a matter of being able to put the transfer case in neutral. But check the manual to ensure there's no other requirement or restriction.
For a little more explanation of the weight ratings of a motorhome, click the
Library button above, select
RV-related how-to's and click
Weight capacity calculations.