Hi Jeff and welcome aboard,
When we first considered a trailerable powerboat for our intended travels, all my research led us to the C-Dory. At that time, the TomCat was the TC-24; a fine boat, but I read about people having problems with launching/retrieving. Bill and El seemed to do fine with the 22... that was the boat we went to the Seattle Boat Show to buy. Being able to see the 22 and the 25 side by side, brought us to the decision that the 25 would best fit our needs. By now, the TC255 was in production, and there was one at the boat show... very nice, but much heavier and more expensive. And, there was still the trailering issue (now pretty well resolved with the TC255).
We had a one ton campervan that we intened to use to pull the newly-ordered CD-25; 8400 lb towing capacity. We ordered the boat with blue trim to match the van with its blue graphics. I thought we were all set.
The more I corresponded with other CD-25 owners, the more concerned I became that the van would be marginal for the distances and terrain we'd be towing. Big Red (our tow vehicle, a GMC Sierra 2500 Duramax) came after we'd put our money down for the C-Dory.
So, yes, the GMC can certainly handle more weight than Wild Blue. There are many differences between the TC255 and the CD-25 besides the weight. The CD-25 sits lower on the trailer, making it easier to launch/retrieve. Now, if you've ever seen Brent and Dixie with their TomCat, you'd see that they make it look easy. But, physics and experience aside, lower works better for us. The CD-25 sits between the wheels of the trailer, the TC255 sits on top of the wheels.
After a year racking up the miles, we still find that our average speed is around 10 knots... we're either doing 15-18 or 6-8. It fits our cruising tastes. The TomCat is more comfortable faster. And it certainly is a much faster boat.
It should be - twice the horsepower, twice the maintenance compared to our single.
The bed and the storage on the TomCat are a hands down winner. But the real decision-maker for us was something less tangible. The bridge deck on the TomCat is very low... I've sailed catamarans and knew that this makes for a pounding. Even at anchor, there is the thump, thump, thump with a low bridge deck. Wild Blue is quiet at anchor; oh, she "sails" around some, but there is very little noise or vibration.
The dream is: cruising along still waters, a white plume behind the boat, contrasting against the turquoise water. The reality (for us) is: many more miles on the trailer than the water; more hours per day at anchor (or on the dock) than motoring. We run 18 knots to get somewhere, but spend plenty of time at 6-8 knots gawking and grinning. Wild Blue fits our style. Plus, she just "looks right" to us - another intangible.
Human nature being what it is, we all will try to justify what we do. If I were to win the lottery (and apparently you have to buy a ticket first), I might get another boat. No, we'd still keep Wild Blue, just maybe add a boat or six to the fleet.

For many years, I longed for a 6 car garage with a one-bedroom apartment above it. Now, I think I'd like a 6-slip marina... :wink:
Hope this has helped. You will find many discussions of the 22 vs 25 vs the TC255 in the archives here. All are great boats. It just depends on how each couple (or individual) will use them. I have had many folks who own bigger boats (sail and power) comment to us about Wild Blue. When they hear how we've been traveling, it's usually, "That is SO smart." Well, we're still figuring out things along the way... but we're confident that Wild Blue was the right choice for us at this time. If you have any other questions or want to talk more about this, feel free to send me a private message.
Good luck with your decisions.
Best wishes,
Jim B.