What state are you licensed in?  So long as you meet the
qualifications in your state, you will quailify everywhere else.

According to this there is no such thing as a class 1 license in the US,
Canada has class 1 licenses:

http://en.wikipedia.org/wiki/Driver's_license

Commercial Driver's Licenses (CDL)

 Class A: Combination vehicle of 26,000 lb (11,790 kg) or more
 Class B: Single (straight) vehicle of 26,000 lb (11,790 kg) or more (also
includes most buses)
 Class C: Commercial vehicle that doesn't fit classes A or B, but is
placarded for hazardous materials or is intended to carry 14 passengers or
more (excluding Georgia)
Standard Qualified Driver's Licenses

 Class D: Passenger vehicle (although this category is universal, the
actual title varies by state: for example, Mississippi calls this Class R,
while Texas calls it Non Commercial Class C, Georgia calls this Class C,
Florida calls this Class E and Hawaii calls it Class 4)
 Class E: Taxi Driver or Chauffeur. Taxi driver licensing in the United
States is somewhat complicated. A Class E (or similar) license is issued by
the state department or agency with the power to issue driver's licenses.
Not all state licensing boards (such as Massachusetts) require or issue a
chauffeur license. However, regardless of whether a license is required at
the state level or not, a license or permit must be obtained from local
authorities to operate a taxi, usually the city or county one wishes to
drive in. This is separate to and must be obtained in addition to any
license required at the state level.
 Class M: Motorcycle-{excluding any motorcycle 50 cc and under} (unlike in
Europe, the United States does not differentiate between low and full
powered motorcycles for the purposes of licensing)
Some states also have additional classifications. Hawaii, for example has a
separate license category for drivers who only operate mopeds. South
Carolina has non-commercial versions of every commercial class license.

Commercial Driver's License Endorsements

Professional drivers are usually required to add endorsements to their CDL
in order to drive certain types of vehicles that require additional
training, such as those equipped with air brakes. CDL endorsements are also
common among all states, and the training and testing requirements are
regulated by the Federal Government. Endorsements are as follows:

 P: Passenger Transport (Required to drive a bus that carries 14 people or
more)
 H: Hazardous Materials (Also requires a TSA criminal background check as
well as a written exam. You must be a US Citizen to obtain an H or X
endorsement.)
 N: Tank Vehicles, Required for carrying liquids in bulk
 T: Double/ Triple Trailers (Road trains) (Class A licenses only)
 X: Hazardous Materials and Tank Combination
 L: Air Brakes
 S: School Bus (Also requires a TSA criminal background check, a sex
offender registry check, and a "P" endorsement.)
In the U.S., minimum driving ages vary from state to state ranging from 14
to 18. Some examples are below. The minimum age for a Commercial Driver's
License is typically 21, except for school bus drivers, which is sometimes
as high as 25, although some individual states permit drivers who are 18 to
apply for a non HazMat, non school bus intrastate only CDL.

I seriously doubt that as a rule states recognize other states licenses. I
don't think a 14 year old with a learners permit from Missouri would be
allowed to drive in New York City.

Lloyd;

I went to the Saskatchewan Auto Insurance site.  I found this link that was
from 2004.
http://www.sgi.sk.ca/sgi_pub/roadsmart_report/may_04_article3.html
.  I would suggest that you go to your local insurance agent and pose this
question to them.  They best can answer that.
I know in BC that if your travel trailer exceeds 4600KG then you need an
endorsement on your licence.  I have a motorhome that weighs 31000 lb (GVWR)
and all I require is an air brake endorsement.
Burt

So . . . you are only pulling 5000 lbs each?? No problem! :-)

When it comes to Insurance Law, that's my professional area of
expertise.

You don't have to go to the States, to get into trouble; you can do
that very well right here at home. At the outset, if you are driving a
vehicle or combination of vehicles for which you are not "authorized
by law" to operate, then the entirety of your insurance coverage is
null and void.

Whether Canada or the USA, if you are caught operating a vehicle for
which you are not licenced to drive; apart from a multitude of fines
that might be imposed, you will have to hire a qualified driver to
move your vehicle from the point you were caught. And yes, I've seen
reports of such incidences.

And as for Burt's well intentioned, but stoopid advice: "Contact your
insurance Agent", or whatever; insurance agents share a common
characteristic with used car salesmen: i.e. they don't know squat
about what they are selling; they've never read the contracts; and
knowledge of the product they are pedalling, extends no further than
knowing where their pidgeon should sign the contract!